CN110756382A - Limited coating width coating prevention edge bulging device and coating equipment - Google Patents

Abstract

The application provides an anti-coating drum edge device and coating equipment of limited coating width, coating equipment includes coating die head and coating backing roll, coating die head has the coating die lip near the one side of coating backing roll, the device includes: a die lip block arranged between the coating die lip and the coating back roll and used for limiting the flowing boundary of the slurry and a scraper wheel acting on the edge of the coating area of the pole piece material. This application makes coating width fixed among the coating process to coating drum limit problem has been solved, has easy and simple to handle, and control accuracy is high, the advantage that the operation process is stable.

Description

Limited coating width coating prevention edge bulging device and coating equipment

Technical Field

The application relates to the field of lithium ion battery equipment, in particular to a coating width limiting anti-coating edge bulging device and coating equipment.

Background

The coating process is an important process in the manufacturing process of the lithium ion battery, and is a process of coating the slurry on the surface of a pole piece, and the performance of the battery is directly influenced by the quality of the control capability of coating parameters.

Currently, a large number of coating methods are used, including extrusion coating and transfer coating. Wherein, the transfer coating width is controllable, but the defects of low coating speed, unstable coating surface density and the like exist; extrusion coating can meet most of coating requirements and is widely used in the market, but the problems of complex coating parameter adjustment, high control precision and the like exist; especially, the coating gap adjusting and coating width process is complicated and the coating process is easy to have the problem of drum edge.

Particularly, the coating width is mainly adjusted through the combined action of the die head gap and the die head pressure, and the defects that the coating width is not adjustable due to the fact that the proportion of the die head pressure/the coating gap to the coating width is not proportional to the slurry consistency, the coating width is not controllable due to unreasonable installation positions of the die heads, the coating width cannot meet the process requirements due to unreasonable openings of gaskets and the like exist. The gasket is needed to be manufactured again when the opening of the gasket is not proper, the coating gap adjusting process is troublesome, the adjustment of the density parameter of the coating surface is influenced, and the adjusting difficulty of the coating die head is increased.

In addition, the gasket design can solve the problem of coating edge bulging, but for different slurries, gaskets with different chamfers need to be designed and tested, so that the manufacturing cost is increased. The problem of edge bulging can be solved by blowing the coating surface uniformly by adopting a tuyere, but the problem of poor edge bulging effect and difficulty in controlling the air volume uniformity and the blowing angle are solved in a non-contact manner, so that the problem of edge thinning caused by edge bulging is solved, the N/P value (wherein N represents a negative electrode and P represents a positive electrode) is influenced, and the phenomenon of lithium precipitation possibly occurs.

Disclosure of Invention

The application aims to solve the technical problems that the existing coating mode is complex in width adjustment and coating drum edge is coated.

In order to solve the technical problem, the application discloses an anti-coating bulging device for limiting coating width, which is applied to a coating device, wherein the coating device comprises a coating die head and a coating back roller, and one side of the coating die head, which is close to the coating back roller, is provided with a coating die lip; the device comprises: a die lip block arranged between the coating die lip and the coating back roll and used for limiting the flowing boundary of the slurry and a scraper wheel acting on the edge of the coating area of the pole piece material.

Optionally, the part of the die lip block close to the coating back roll is curved by a sharp angle.

Optionally, the outer layer of the die lip block is made of teflon, and the inner part of the die lip block is made of stainless steel.

Optionally, the thickness of the outer layer of the die lip block is 10-40 μm.

Optionally, the scraping wheel comprises a connecting section, a tab blank reserving section, a thinning section and a thinning top section which are sequentially connected, and the tab blank reserving section, the thinning section and the thinning top section are circular truncated cones.

Optionally, the surface of the thinned section is provided with oblique threads, and the thinned section is sequentially divided into an oblique thread I area, an oblique thread II area, an oblique thread III area and an oblique thread IV area, wherein from the I area to the IV area, the thread pitch is gradually increased, and the thread depth is gradually reduced.

Optionally, the outer layers of the tab whitening section, the thinning section and the thinning top section are made of teflon, and the inner portions of the tab whitening section, the thinning section and the thinning top section are made of stainless steel.

Optionally, the thickness of the outer layer of the tab blank section, the thinning section and the thinning top section is 10-40 μm.

Optionally, the thinning thickness of the tab blank section is 20 μm to 40 μm.

Optionally, the thinning thickness of the thinning section is 10 μm to 40 μm, and the length is 5mm to 20 mm.

Optionally, the thinned top section has a thinned thickness of 100 μm to 300 μm.

Optionally, the coating width limiting anti-coating drum edge device further comprises: and the connecting rod is connected with the connecting section of the scraping wheel.

Optionally, the coating width limiting anti-coating drum edge device further comprises: and a rotation adjusting groove connected with the connecting rod.

Optionally, the coating width limiting anti-coating drum edge device further comprises: the die lip block is connected with the fixing mechanism, and the rotary adjusting groove is formed in the fixing mechanism.

The application also provides a coating device comprising the coating width limiting coating edge preventing device.

Compared with the prior art, the coating width limiting and coating edge bulging preventing device applied to the coating equipment has the following beneficial effects:

the lip block is disposed between the coating lip and the coating backing roll for defining a slurry flow boundary, i.e., a coating boundary, thereby fixing a coating width during coating regardless of the influence of a coating die gap and a coating pressure on the coating width. Meanwhile, the edge of a coating area is thinned by the scraping wheel, so that the problem of edge bulging during coating is solved. Compared with the prior art, the technical scheme of the application has the advantages of simplicity and convenience in operation, high control precision and stable operation process.

The position of the scraping wheel can be moved by adopting the connecting rod and the rotary adjusting groove, so that edge thinning pole pieces with different thinning thicknesses and lengths can be prepared, and the uncontrollable property of the thickness of the coating pole piece can be avoided by the air nozzle.

The material scraping wheel thinning section is subjected to thread treatment, so that the scraping slurry can be prevented from overflowing to the lug, and the lug pollution prevention effect is achieved.

The outer layers of the die lip block and the scraping wheel are made of Teflon materials, so that the coating area and the pole piece materials are not damaged, and the coating area and the pole piece materials are prevented from being abraded by structural parts made of common materials.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic perspective view of an anti-coating drum edge device for limiting coating width applied to a coating apparatus according to an embodiment of the present application;

FIG. 2 is a schematic view of a die lip block according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a scraping wheel according to an embodiment of the present application;

fig. 4 is a schematic side view of a die lip block and scraper wheel connection according to an embodiment of the present disclosure.

The following is a supplementary description of the drawings:

1-a coating zone of pole piece material; 2a, 2 b-tab blanking areas; 3-coating a back roll; 4-a coating die head; 5-coating a die lip; 6-die lip blocking block; 7-a scraping wheel;

61-die lip block curved surface; 62-outer layer of die lip block; 63-inside the die lip block; 64-bending the upper sharp corner; 65-lower included angle bending;

71-a connecting segment; 72-tab whiteout section; 73-main section outer layer; 74-inside the main section; 75-helical thread region I; 76-helical thread II zone; 77-helical thread III zone; 78-oblique thread IV zone; 79-thinned top section;

81-connecting rod; 82-rotation adjustment groove; 9-fixing mechanism.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

In order to solve the technical problems in the related prior art, the embodiment of the application provides a coating width limiting anti-coating edge bulging device, which limits the coating width by adopting a die lip block and thins the edge of a coating area by adopting a scraping wheel. The following detailed description is made with reference to the embodiments and the accompanying drawings.

Referring to fig. 1, the coating width limiting anti-coating edge-bulging device of the present embodiment is applied to a coating apparatus, the coating apparatus at least includes a coating die head 4 and a coating back roll 3, one side of the coating die head 4 close to the coating back roll 3 is provided with a coating die lip 5 as an outlet of coating slurry, a pole piece material (for example, a foil material) is attached to the coating back roll 3 and moves with the coating back roll 3, and the coating slurry is coated on the pole piece material.

The coating width limiting anti-coating drum edge device comprises: a die lip block 6 and a scraping wheel 7 which are arranged between the coating die lip 5 and the coating back roll 3; wherein the lip block 6 is a lip block 6 for defining a slurry flow boundary; the scraping wheel 7 acts on the edge of the coating area 1 of the pole piece material.

As shown in fig. 1, the foil is operated in close proximity to a coating backing roll 3, and the slurry is ejected from a coating die lip 5 of a coating die 4 and adhered to the foil to form a tab coating area 1, and the areas of the foil not coated with the slurry are tab blanking areas 2a, 2 b. The coating edge of the slurry discharge is controlled by a lip block 6, and coating edge thinning treatment is performed by a scraper 7. Fig. 1 shows only the die lip block 6 and the scraping wheel 7 on the tab clearance area 2b side, and in actual use, the die lip block 6 and the scraping wheel 7 may be provided on the tab clearance area 2a side in order to form the tab clearance area 2 a.

The lip block 6 is provided between the back roll 3 and the coating die 4 and blocks the discharge width of the coating lip 5, so that the lip block 6 serves as a slurry flow boundary defining the boundary of the coating slurry, i.e., the boundary of the coating region 1, during the coating process, thereby fixing the coating width of the coating region 1.

Referring to fig. 2, in the present embodiment, one surface of the die lip block 6 close to the back coating roller 3 is a curved surface 61 adapted to the surface of the back coating roller 3, so that the gap between the die lip block 6 and the foil on the back coating roller 3 can be kept consistent, thereby ensuring the coating width to be fixed.

In this embodiment, the inner and outer layers of the die lip block 6 are made of different materials, the outer layer 62 of the die lip block 6 can be made of teflon and has a certain thickness, and the outer layer 62 has the function of preventing sticking and foil damage; the interior 63 of the die lip block 6 is stainless steel and functions to fix the shape of the die lip block 6. The die lip block 6 is arranged between the coating die head 4 and the coating back roll 3, the whole thickness of the die lip block 6 cannot be too large, so the thickness of the outer layer 62 cannot be too large, the processing difficulty is increased due to the too small thickness of the outer layer 62, the damage to a pole piece material due to the too hard inner layer cannot be completely prevented, the gap between the coating die head 4 and the coating back roll 3 is generally 100-300 mu m, and the thickness h of the outer layer 62 of the die lip block 6 can be 10-40 mu m.

Further, the portion of the lip block 6 near the back roll 3 may be curved with a sharp corner. As shown in fig. 2, the upper part 64 and the lower part 65 of the curved surface of the die lip block 6 are both processed by sharp corner bending, which has the function of preventing the die lip block 6 from damaging the tab foil.

The scraping wheel 7 is a mechanism for scraping and bulging the upper layer of the pole piece material and has the function of preventing the coating from bulging. The scraping wheel 7 can be designed into a cone-shaped roller wheel, and the over-thick part of the coating on the pole piece material is scraped by rotation.

The scraper wheel 7 of the present embodiment is structured as shown in fig. 3, and the scraper wheel 7 comprises a connecting section 71 and a main section which are connected, wherein the main section is further divided into a tab blank section 72, a thinning section and a thinning top section 79 which are connected in sequence. The position of the thinning section corresponds to the position of the coating thinning area (namely the area needing thinning at the edge of the coating area 1), and the position of the tab white leaving section 72 corresponds to the position of the tab white leaving area 2b of the pole piece material.

The inner layer and the outer layer of the main section (namely the tab white-remaining section, the material zone thinning section and the thinning top end) of the scraping wheel 7 are made of different materials, the outer layer 73 can be made of a Teflon material and has a certain thickness, and the outer layer 73 can prevent the phenomenon that the appearance of the scraping pole piece material is damaged or scraping marks are generated due to the fact that the material of the outer layer of the scraping wheel 7 is too hard, and the phenomenon of material adhesion caused by unsmooth surface is avoided; the main section interior 74 is stainless steel and serves to fix the shape of the main section of the scraper wheel 7. The thickness of the main section outer layer 73 is too large, which affects the thinning and scraping effect of the scraping wheel, and too small, which increases the processing difficulty and can not completely prevent the inner layer from being too hard and damaging the pole piece material, in this embodiment, the thickness H1 of the main section outer layer 73 may be 10 μm to 40 μm.

In this embodiment, the tab blank section 72, the thinning section and the thinning top section 79 are truncated cones, and the area of the bottom surface of each truncated cone is larger than that of the top surface. The top surface of the tab blank section 72 is connected with the connecting section 71, the tab blank section 72 and the thinning section share the bottom surface, and the top surface of the thinning section and the bottom surface of the thinning top section 79 share the same. The thickness (namely the difference between the radius of the bottom surface and the radius of the top surface) H2 of the tab blank section 72 can be 20-40 μm, the length L1 of the tab blank section 72 can be set according to actual requirements, and the tab blank section 72 leaves a gap for thinning, so that the tab blank section has the effect of preventing the tab from being damaged. The thinning thickness H3 of the thinning section can be 10-40 mu m, the length L2 of the thinning section can be 5-20 mm, and the position of the scraper wheel 7 can be adjusted to select different thinning thicknesses and lengths of the edge of the pole piece coating area. The thinning thickness H4 of the thinning top section 79 can be 100-300 mu m, the length L3 of the thinning top section 79 can be set according to actual requirements, and the thinning top section 79 has the functions of preventing the scraping wheel 7 from wearing the internal appearance of the coating pole piece material and preventing the scratch phenomenon.

Further, the surface of the thinning section is provided with oblique threads from the lug blank-keeping section 72 to the thinning top section 79, the thinning section is sequentially divided into an oblique thread I area 75, an oblique thread II area 76, an oblique thread III area 77 and an oblique thread IV area 78, the thread distance is gradually increased from the I area to the IV area, and the thread depth is gradually reduced. For example, the pitch of the helical thread I region 75 is 0.2mm, and the depth of the thread is 3 μm; the pitch of the threads of the oblique thread II zone 76 was 0.5mm, the depth of the threads was 2 μm; the pitch of the threads of the region 77 of the inclined threads III is 1mm, and the depth of the threads is 1 μm; the pitch of the helical thread IV zone 78 was 1.5mm and the depth of the thread was 0.5. mu.m. The thinning section is subjected to thread treatment in different areas, the threads of the inclined thread I area 75 are screwed from the edge of the coating blank area to the coating material area, the thread distance is gradually increased from the I area to the IV area, the thread depth is gradually reduced, and the effect of preventing scraping slurry from flowing to the lug blank area to pollute the lug is achieved.

With continued reference to fig. 4, the coating width limiting anti-coating drum edge device further comprises: a connecting rod 81 connected to the connecting section 71 of the scraping wheel 7, and a rotation adjusting groove 82 connected to the connecting rod 81. The distance between the connecting rod 81 and the pole piece material can be adjusted by adjusting the position of the connecting rod 81 in the rotary adjusting groove 82, so that the contact thickness between the scraping wheel 7 and the pole piece material is conveniently controlled, and the coating pole piece with the coating thickness meeting the requirement is prepared.

The coating width limiting coating drum edge prevention device of the present embodiment may further include: the fixing mechanism 9 arranged on the coating die head 4, the die lip block 6 and the scraper 7 are arranged between the coating back roller 3 and the coating die head 4 through the fixing mechanism 9. Specifically, the lip block 6 is connected to the fixing mechanism 9, and the rotation adjusting groove 82 is provided on the fixing mechanism 9. In other embodiments, the connecting rod 81 may be directly fixed to the fixing mechanism 9 (if the position of the scraper 7 does not need to be adjusted), or other adjusting mechanisms capable of moving the position of the scraper 7 may be arranged on the fixing mechanism 9.

In conclusion, upon reading the present detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure can be presented by way of example only, and not limitation. Those skilled in the art will appreciate that the present application is intended to cover various reasonable variations, adaptations, and modifications of the embodiments described herein, although not explicitly described herein. Such alterations, improvements, and modifications are intended to be suggested by this disclosure, and are within the spirit and scope of the exemplary embodiments of this disclosure.

Furthermore, certain terminology has been used in this application to describe embodiments of the disclosure. For example, "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various portions of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined as suitable in one or more embodiments of the disclosure.

It should be appreciated that in the foregoing description of embodiments of the disclosure, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of the subject disclosure. Alternatively, various features may be dispersed throughout several embodiments of the application. This is not to be taken as an admission that any of the features of the claims are essential, and it is fully possible for a person skilled in the art to extract some of them as separate embodiments when reading the present application. That is, embodiments in the present application may also be understood as an integration of multiple sub-embodiments. And each sub-embodiment described herein is equally applicable to less than all features of a single foregoing disclosed embodiment.

In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the application are to be understood as being modified in certain instances by the term "about", "approximately" or "substantially". For example, "about," "approximately," or "substantially" can mean a ± 20% variation of the value it describes, unless otherwise specified. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible.

Each patent, patent application, publication of a patent application, and other material, such as articles, books, descriptions, publications, documents, articles, and the like, cited herein is hereby incorporated by reference. All matters hithertofore set forth herein except as related to any prosecution history, may be inconsistent or conflicting with this document or any prosecution history which may have a limiting effect on the broadest scope of the claims. Now or later associated with this document. For example, if there is any inconsistency or conflict in the description, definition, and/or use of terms associated with any of the included materials with respect to the terms, descriptions, definitions, and/or uses associated with this document, the terms in this document are used.

Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Accordingly, the disclosed embodiments are presented by way of example only, and not limitation. Those skilled in the art may implement the present application in alternative configurations according to the embodiments of the present application. Thus, embodiments of the present application are not limited to those embodiments described with accuracy in the application.

Claims (15)

1. An anti-coating drum edge device for limiting coating width, which is applied to a coating device, wherein the coating device comprises a coating die head and a coating back roll, one side of the coating die head, which is close to the coating back roll, is provided with a coating die lip, and the device is characterized by comprising: a die lip block arranged between the coating die lip and the coating back roll and used for limiting the flowing boundary of the slurry and a scraper wheel acting on the edge of the coating area of the pole piece material.

2. The coating width limiting anti-bulging device according to claim 1, wherein the portion of the die lip block close to the coating back roll is curved with a sharp corner.

3. The coating width limiting anti-bulging device according to claim 1, wherein the outer layer of the die lip block is made of teflon, and the inner part of the die lip block is made of stainless steel.

4. The coating width-limiting anti-bulging device according to claim 3, wherein the outer layer thickness of said die lip block is 10 μm to 40 μm.

5. The coating width limiting anti-bulging device according to claim 1, wherein the scraper wheel comprises a connecting section, a tab blank section, a thinning section and a thinning top section which are connected in sequence, and the tab blank section, the thinning section and the thinning top section are truncated cones.

6. The coating width limiting anti-bulging device according to claim 5, wherein the surface of the thinned section is provided with a helical thread, and the thinned section is divided into a helical thread I area, a helical thread II area, a helical thread III area and a helical thread IV area in sequence, and the thread pitch is gradually increased and the thread depth is gradually reduced from the I area to the IV area.

7. The coating width limiting anti-bulging device according to claim 5, wherein the outer layers of the tab whitening section, the thinning section and the thinning top section are made of Teflon materials, and the inner portions of the tab whitening section, the thinning section and the thinning top section are made of stainless steel materials.

8. The coating width limiting anti-bulging device according to claim 5, wherein the outer layer thickness of the tab whitening section, the thinning section and the thinning top section is 10-40 μm.

9. The coating width limiting anti-bulging device according to claim 5, wherein the thinned thickness of the tab leaving white section is 20-40 μm.

10. The coating width limiting anti-bulging device according to claim 5, wherein the thinned section has a thinned thickness of 10-40 μm and a length of 5-20 mm.

11. The coating width limiting anti-bulging device according to claim 5, wherein the thinned top section has a thinned thickness of 100 μm to 300 μm.

12. The coating width limiting anti-drumming device according to claim 5, further comprising: and the connecting rod is connected with the connecting section of the scraping wheel.

13. The spread-defining drumhead prevention device as recited in claim 12, further comprising: and a rotation adjusting groove connected with the connecting rod.

14. The spread-defining drumhead prevention device as recited in claim 13, further comprising: the die lip block is connected with the fixing mechanism, and the rotary adjusting groove is formed in the fixing mechanism.

15. A coating apparatus comprising an anti-coating drum edge device as defined in any one of claims 1 to 14 for coating width.

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