Coating die head and coating machine
By designing a coating die head with a split structure and adjusting the runner gap using an integrated T-block, the problems of uneven slurry and difficult die maintenance in the lithium-ion battery coating process are solved, and the effect of uniform slurry distribution and easy maintenance of die head is achieved.
Patent Information
- Application Number
- CN202421228893.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-05-31
AI Technical Summary
In the existing lithium-ion battery coating process, the slit extrusion coating die head results in uneven lateral weight of the slurry on the foil, and the integrated T-block structure is difficult to install, disassemble and maintain.
A coating die head is designed, and the first and second integrated T-shaped blocks with a split structure are used to adjust the flow channel gap between the mold cavity and the lip of the die head through the first and second slurry adjustment parts, avoiding the inclusion of slurry between adjacent T-shaped blocks, and facilitating the installation, disassembly and maintenance of the die head.
The uniform distribution of the slurry lateral weight on the foil is achieved, which avoids the appearance of dark marks, simplifies the installation and maintenance process of the die head, and ensures the normal operation of the coating process.
Smart Images
Figure CN222829979U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery coating, in particular to a coating die head and a coating machine. Background Art
[0002] The current lithium-ion battery coating process is to achieve faster coating speed and uniformity, and mostly adopts the form of slit extrusion coating, and uses an extrusion die to achieve coating. This extrusion die consists of an upper and lower die and a gasket. There is a cavity between the upper and lower dies, and the upper and lower dies pass through the gasket to form a slit at the lip. Due to the axial pressure gradient in the cavity, the speed of the slurry when leaving the slit outlet is uneven, which ultimately causes the lateral weight of the extruded slurry on the foil to be uneven.
[0003] In order to solve this problem, the existing solution is to add multiple T-blocks arranged laterally on the upper die head, with a size of 25 to 45 mm. The T-blocks are arranged in the slit section between the cavity and the lip of the die head. The T-blocks are connected to multiple micrometers on the outside of the upper die head. By turning the micrometers, the flow channel gap between the cavity and the lip of the die head can be adjusted, thereby adjusting the flow rate of the slurry sprayed from the lip, thereby adjusting the uniformity of the lateral weight of the final extruded slurry on the foil. However, due to the gaps between adjacent T-blocks, slurry is easily mixed, and the pole pieces generated by coating everywhere are prone to dark marks.
[0004] In the prior art, although an integrated T-block structure is used to avoid slurry inclusion between adjacent T-blocks, the coating die head using such an integrated T-block is large in size, difficult to install and disassemble, and inconvenient for maintenance. Utility Model Content
[0005] The utility model provides a coating die head and a coating machine, which can facilitate the installation and disassembly of the coating die head and make it easy to maintain.
[0006] The embodiments of the present invention can be implemented as follows:
[0007] In a first aspect, the utility model provides a coating die head, comprising:
[0008] Upper die head;
[0009] A lower die head, the lower die head is mounted on the upper die head;
[0010] A gasket, the gasket is sandwiched between the upper die head and the lower die head, and the gasket has a first diverter portion;
[0011] a first slurry regulating member, the first slurry regulating member being disposed on the upper die head, the first slurry regulating member comprising a first integrated T-block, the first integrated T-block being integrally formed by a plurality of first T-blocks; and
[0012] A second slurry regulating member, the second slurry regulating member is disposed on the upper die head, the second slurry regulating member comprises a second integrated T-block, and the second integrated T-block is integrally formed by a plurality of second T-blocks;
[0013] The first integrated T-block and the second integrated T-block are in contact or spaced apart at a position close to the first diverter portion.
[0014] In an optional embodiment, one of the first T-blocks of the first integrated T-block and one of the second T-blocks of the second integrated T-block are in contact or spaced apart at a position close to the first diverter.
[0015] In an optional embodiment, a spacing distance between one of the first integrated T-blocks and one of the second integrated T-blocks at a position close to the first diverter portion is less than or equal to 30 um.
[0016] In an optional embodiment, the first slurry regulating member further includes a plurality of first micrometers, the plurality of first micrometers correspond to the plurality of first T-blocks one by one, and the first micrometers are connected to the first T-blocks.
[0017] In an optional embodiment, the second slurry regulating member further includes a plurality of second micrometers, the plurality of second micrometers correspond to the plurality of second T-blocks one by one, and the second micrometers are connected to the second T-blocks.
[0018] In an optional embodiment, the first diverter portion is located in a middle area of the gasket.
[0019] In an optional embodiment, the gasket further has a second diverter portion, and the second diverter portion is spaced apart from the first diverter portion.
[0020] In an optional embodiment, there are multiple second flow splitters, and the second flow splitters are distributed on both sides of the first flow splitter.
[0021] In an optional embodiment, the same number of the second diversion parts are distributed on both sides of the first diversion part.
[0022] In a second aspect, the utility model provides a coating machine, comprising the coating die head described in any one of the aforementioned embodiments.
[0023] The beneficial effects of the coating die head and the coating machine of the embodiment of the utility model include, for example:
[0024] The utility model provides a coating die head, which comprises an upper die head, a lower die head, a gasket, a first slurry regulating member and a second slurry regulating member, the lower die head is installed on the upper die head, the gasket is clamped between the upper die head and the lower die head, the gasket has a first diversion portion, the first slurry regulating member is arranged on the upper die head, the first slurry regulating member comprises a first integrated T-block, the first integrated T-block is formed by a plurality of first T-blocks, the second slurry regulating member is arranged on the upper die head, the second slurry regulating member comprises a second integrated T-block, the second integrated T-block is formed by a plurality of second T-blocks, wherein the first integrated T-block and the second integrated T-block are in contact or spaced apart at a position close to the first diversion portion, due to The first slurry regulating member includes a first integrated T-block, which is formed by a plurality of first T-blocks in one piece; the second slurry regulating member includes a second integrated T-block, which is formed by a plurality of second T-blocks in one piece, so that slurry can be avoided from being mixed between adjacent T-blocks; at the same time, the first integrated T-block and the second integrated T-block are both independent components, so that the existing integral integrated T-block structure is changed into a split structure, which is convenient for installation and disassembly of the coating die head and maintenance; in addition, the first integrated T-block and the second integrated T-block are in contact or spaced at a position close to the first diversion portion, which will not affect the normal distribution of the normally extruded slurry on the foil, thereby ensuring the normal operation of the coating process.
[0025] The utility model provides a coating machine, which comprises the coating die head mentioned above and has all the functions of the coating die head mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 A schematic diagram of a coating die provided in an embodiment of the present utility model;
[0028] Figure 2 A schematic diagram of the relative positions of a gasket, a first integrated T-block, and a second integrated T-block provided in an embodiment of the utility model;
[0029] Figure 3 It is a schematic diagram of the relative positions of the upper die head, the first integrated T-block, and the second integrated T-block provided in the embodiment of the utility model.
[0030] Icons: 1000-coating die; 100-upper die; 200-lower die; 300-gasket; 310-first diversion portion; 320-second diversion portion; 400-first slurry adjusting member; 410-first integrated T-block; 420-first micrometer; 500-second slurry adjusting member; 510-second integrated T-block; 520-second micrometer; 1001-gap. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0034] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.
[0035] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.
[0036] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.
[0037] In the production process of lithium batteries, there is an essential coating process. In order to ensure the uniformity of coating and consistency of appearance, high-speed coating currently adopts extrusion coating method, and the die head used in extrusion coating method is extrusion die head.
[0038] As mentioned in the background technology, the current lithium-ion battery coating process is for faster coating speed and uniformity, and mostly adopts the form of slit extrusion coating, and uses an extrusion die to achieve coating. This extrusion die consists of an upper and lower die and a gasket. There is a cavity between the upper and lower die. The upper and lower die pass through the gasket to form a slit at the lip. During coating, after the slurry from the inlet in the die enters the cavity, it flows toward the closed end under the action of the axial pressure gradient, and then leaks into the slit along the direction of the die lip. The slurry is finally sprayed out at the outlet of the die slit and coated on the foil. Due to the existence of an axial pressure gradient in the cavity, the speed of the slurry when leaving the slit outlet is uneven, which ultimately causes the lateral weight of the extruded slurry on the foil to be uneven.
[0039] In order to solve this problem, the existing solution is to add multiple T-blocks arranged laterally on the upper die head. The T-blocks are arranged in the slit section between the cavity and the lip of the die head. The T-blocks are connected to multiple micrometers on the outside of the upper die head. By turning the micrometers, the flow channel gap of the slit between the cavity and the lip of the die head can be adjusted, thereby adjusting the flow rate of the slurry sprayed from the lip, thereby adjusting the uniformity of the lateral weight of the finally extruded slurry on the foil.
[0040] That is to say, in the production process, due to the characteristics and fluidity of the slurry, the surface density fluctuates, and the micrometer needs to be adjusted to drive the T-block up and down. However, due to the gaps between adjacent T-blocks, the slurry is easily mixed, and the pole pieces generated by coating everywhere are prone to dark marks.
[0041] At the same time, the slurry enters the main material chamber from the feed port, and flows to the discharge chamber when the liquid level in the main material chamber is full, and the surface density is adjusted through the T-block. Because the slurry is flowing, it is necessary to continuously adjust the micrometer to drive the T-block up and down to adjust the surface density, which will cause the gap between adjacent T-blocks to increase, causing small particles in the slurry to be sandwiched between the T-blocks, resulting in the appearance of dark marks.
[0042] In addition, dark marks appear on the pole pieces produced by coating, resulting in thickness deviation and inconsistent appearance, which does not meet the process requirements. In addition, the dark marks will also cause friction marks on the upper die head, affecting the life of the upper die head.
[0043] Although some existing solutions use an integrated T-block structure to avoid slurry inclusion between adjacent T-blocks, the coating die head using such an integrated T-block is large in size, difficult to install and disassemble, and inconvenient for maintenance.
[0044] In view of this, please refer to Figure 1-Figure 3 The coating die head 1000 and the coating machine provided in the embodiment of the utility model can solve this problem, which will be described in detail below.
[0045] The utility model provides a coating machine, which includes a coating die head 1000. The coating die head 1000 can avoid slurry from being mixed between adjacent T-blocks. At the same time, the first slurry regulating member 400 and the second slurry regulating member 500 of the coating die head 1000 are convenient for installation and disassembly, and are easy to maintain.
[0046] It should be noted that the coating machine may also include other necessary components to realize the functions of the coating machine. The remaining necessary components may adopt general component devices well known to those skilled in the art, and will not be described in detail here.
[0047] Specifically, the coating die 1000 includes an upper die 100, a lower die 200, a gasket 300, a first slurry regulating member 400 and a second slurry regulating member 500. The lower die 200 is installed on the upper die 100, the gasket 300 is clamped between the upper die 100 and the lower die 200, the gasket 300 has a first diversion portion 310, the first slurry regulating member 400 is arranged on the upper die 100, the first slurry regulating member 400 includes a first integrated T-block 410, and the first integrated T-block 410 is integrally formed by multiple first T-blocks, the second slurry regulating member 500 is arranged on the upper die 100, the second slurry regulating member 500 includes a second integrated T-block 510, and the second integrated T-block 510 is integrally formed by multiple second T-blocks.
[0048] It is easy to understand that the first integrated T-block 410 and the second integrated T-block 510 are both disposed on the upper die head 100 .
[0049] Among them, the first integrated T-block 410 and the second integrated T-block 510 are in contact or spaced apart at a position close to the first diversion portion 310. Since the first slurry regulating member 400 includes the first integrated T-block 410, the first integrated T-block 410 is integrally formed by multiple first T-blocks, and the second slurry regulating member 500 includes the second integrated T-block 510, and the second integrated T-block 510 is integrally formed by multiple second T-blocks, which can avoid slurry from being mixed between adjacent T-blocks (for example, between adjacent first T-blocks or between adjacent second T-blocks). At the same time, the first slurry regulating member 400 and the second slurry regulating member 500 are both independent components, which transforms the existing integral integrated T-block structure into a split structure, which is convenient for the installation and disassembly of the coating die 1000 and for maintenance.
[0050] In addition, the first integrated T-block 410 and the second integrated T-block 510 are in contact or spaced apart at a position close to the first diverter 310 , which will not affect the normal distribution of the normally extruded slurry on the foil, thereby ensuring the normal operation of the coating process.
[0051] The coating die head 1000 can ensure that no dark marks are produced during the coating process, thus avoiding the problems caused by bad dark marks. Meanwhile, the first slurry adjusting member 400 and the second slurry adjusting member 500 are independent components, which are convenient for disassembly or installation.
[0052] It should be noted that one of the first T-blocks of the first integrated T-block 410 and one of the second T-blocks of the second integrated T-block 510 are in contact or spaced apart at a position close to the first diverter portion 310 .
[0053] In this embodiment, reference can be made to Figure 1 , the rightmost side of the first integrated T-block 410 is in contact with or spaced from the leftmost side of the second integrated T-block 510 .
[0054] Among them, when the rightmost side of the first integrated T-block 410 and the leftmost side of the second integrated T-block 510 are spaced apart, the spacing distance between one of the first T-blocks of the first integrated T-block 410 and one of the second T-blocks of the second integrated T-block 510 at a position close to the first diversion portion 310 is less than or equal to 30um.
[0055] That is to say, in this embodiment, reference can be made to Figure 1 There is a gap 1001 at the rightmost side of the first integrated T-block 410 and the leftmost side of the second integrated T-block 510. The gap 1001 is less than or equal to 30 um. For example, the gap 1001 can be 30 um or 15 um.
[0056] In order to facilitate the adjustment of the first integrated T-block 410 and the second integrated T-block 510, the first slurry adjusting member 400 also includes a plurality of first micrometers 420, and the plurality of first micrometers 420 correspond one to one to the plurality of first T-blocks, and the first micrometers 420 are connected to the first T-blocks, that is, each first micrometer 420 is connected to a first T-block.
[0057] In an optional embodiment, the second slurry adjusting member 500 also includes multiple second micrometers 520, and the multiple second micrometers 520 correspond one to one with multiple second T-blocks. The second micrometers 520 are connected to the second T-blocks, that is, each second micrometer 520 is connected to a second T-block.
[0058] In this embodiment, please refer to Figure 2 The first diversion portion 310 is located in the middle area of the gasket 300. The middle area here can be understood as Figure 2 The middle portion of the middle gasket 300 in the left-right direction, at this time, the length of the first integrated T-block 410 and the length of the second integrated T-block 510 are substantially equal.
[0059] It is easy to understand that, due to the presence of the first diverter portion 310, a blank area corresponding to the first diverter portion 310 will be formed in the coating area (equivalent to the absence of slurry here). Therefore, contacting or spacing the rightmost side of the first integral T-block 410 and the leftmost side of the second integral T-block 510 at a position close to the first diverter portion 310 will not affect the normal coating process.
[0060] In addition, the gasket 300 also has a second diverter portion 320, which is separated from the first diverter portion 310. The number of second diverter portions 320 is multiple, and the second diverter portions 320 are distributed on both sides of the first diverter portion 310. The same number of second diverter portions 320 are distributed on both sides of the first diverter portion 310. Specifically, in this embodiment, the number of second diverter portions 320 is four, and two second diverter portions 320 are distributed on both sides of the first diverter portion 310.
[0061] In summary, the coating die 1000 includes an upper die 100, a lower die 200, a gasket 300, a first slurry adjusting member 400 and a second slurry adjusting member 500. The lower die 200 is installed on the upper die 100, the gasket 300 is clamped between the upper die 100 and the lower die 200, the gasket 300 has a first diversion portion 310, the first slurry adjusting member 400 is arranged on the upper die 100, the first slurry adjusting member 400 includes a first integrated T-block 410, and the first integrated T-block 410 is integrally formed by multiple first T-blocks, the second slurry adjusting member 500 is arranged on the upper die 100, the second slurry adjusting member 500 includes a second integrated T-block 510, and the second integrated T-block 510 is integrally formed by multiple second T-blocks.
[0062] Among them, the first integrated T-block 410 and the second integrated T-block 510 are in contact or spaced apart at a position close to the first diversion portion 310. Since the first slurry regulating member 400 includes the first integrated T-block 410, which is integrally formed by a plurality of first T-blocks, and the second slurry regulating member 500 includes the second integrated T-block 510, which is integrally formed by a plurality of second T-blocks, slurry can be avoided from being mixed between adjacent T-blocks. At the same time, the first integrated T-block 410 and the second integrated T-block 510 are both independent components, which transforms the existing integral integrated T-block structure into a split structure, facilitating the installation and disassembly of the coating die 1000 and maintenance. In addition, the first integrated T-block 410 and the second integrated T-block 510 are in contact or spaced apart at a position close to the first diversion portion 310, which will not affect the normal distribution of the normally extruded slurry on the foil, thereby ensuring the normal operation of the coating process.
[0063] The coating machine includes the coating die head 1000 described above, and the coating machine has all the functions of the coating die head 1000 described above.
[0064] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A coating die head, characterized in that: include: Upper die head (100); A lower die head (200), wherein the lower die head (200) is mounted on the upper die head (100); A gasket (300), the gasket (300) being sandwiched between the upper die head (100) and the lower die head (200), the gasket (300) having a first diversion portion (310); a first slurry regulating member (400), the first slurry regulating member (400) being disposed on the upper die head (100), the first slurry regulating member (400) comprising a first integrated T-block (410), the first integrated T-block (410) being integrally formed from a plurality of first T-blocks; and A second slurry regulating member (500), wherein the second slurry regulating member (500) is disposed on the upper die head (100), wherein the second slurry regulating member (500) comprises a second integrated T-block (510), and the second integrated T-block (510) is integrally formed from a plurality of second T-blocks; The first integrated T-block (410) and the second integrated T-block (510) are in contact or spaced apart at a position close to the first diverter (310).
2. The coating die head according to claim 1, characterized in that: One of the first T-blocks of the first integrated T-block (410) and one of the second T-blocks of the second integrated T-block (510) are in contact or spaced apart at a position close to the first flow dividing portion (310).
3. The coating die head according to claim 2, characterized in that: A spacing distance between one of the first integrated T-blocks (410) and one of the second integrated T-blocks (510) at a position close to the first diverter (310) is less than or equal to 30 um.
4. The coating die head according to claim 1, characterized in that: The first slurry regulating member (400) further comprises a plurality of first micrometers (420), the plurality of first micrometers (420) corresponding one to one with the plurality of first T-blocks, and the first micrometers (420) are connected to the first T-blocks.
5. The coating die head according to claim 1, characterized in that: The second slurry regulating member (500) further comprises a plurality of second micrometers (520), the plurality of second micrometers (520) corresponding one to one with the plurality of second T-blocks, and the second micrometers (520) are connected to the second T-blocks.
6. The coating die head according to claim 1, characterized in that: The first diversion portion (310) is located in a middle region of the gasket (300).
7. The coating die head according to claim 1, characterized in that: The gasket (300) further comprises a second flow dividing portion (320), wherein the second flow dividing portion (320) is spaced apart from the first flow dividing portion (310).
8. The coating die head according to claim 7, characterized in that: The number of the second flow splitting portions (320) is plural, and the second flow splitting portions (320) are distributed on both sides of the first flow splitting portion (310).
9. The coating die head according to claim 8, characterized in that: The same number of second flow splitters (320) are distributed on both sides of the first flow splitter (310).
10. A coating machine, characterized in that: The coating die comprises the coating die as described in any one of claims 1 to 9.