Lithium battery coating gasket with flow guiding and backflow preventing structure

Abstract

This utility model relates to the field of battery coating equipment and discloses a lithium battery coating pad with a flow guiding and anti-backflow structure. The lithium battery coating pad includes a pad body with a notch on its side. A main slurry guide channel is located on the side wall of the notch away from the opening. Multiple first guide plate groups are arranged on the side wall of the main slurry guide channel. Each first guide plate group includes two symmetrically arranged first guide plates, and the distance between the ends of the two first guide plates in the same group away from the side wall of the main slurry guide channel is greater than the distance between the ends closer to the side wall of the main slurry guide channel. The anti-backflow protrusion structure is serrated and located on the inner wall of the side slurry guide channel. This lithium battery coating pad guides the orderly flow of slurry through the guide plates and further improves the uniformity of the slurry through the anti-backflow protrusion, effectively improving the quality of lithium battery production.

Description

Technical Field

[0001] This utility model relates to the field of battery production coating equipment, specifically to a lithium battery coating pad with a current guiding and anti-backflow structure. Background Technology

[0002] In the lithium battery electrode coating process, in addition to common problems such as cross-contamination and uneven coating, there are also issues such as turbulent flow of slurry in the flow channel and backflow. When the flow rate of slurry in the guide tank is unstable, local eddies will be formed, causing fluctuations in coating thickness; while backflow will cause the slurry that has already flowed to flow in the opposite direction, mixing with the subsequent slurry, destroying the uniformity of the slurry, and affecting the consistency of the electrode.

[0003] The existing coating pads mostly have simple straight or broken line structures for their flow channels. They lack effective flow guiding components to guide the orderly flow of slurry and also lack a dedicated anti-backflow design. This makes it difficult to cope with high viscosity and high flow rate slurry coating scenarios, thus restricting the further improvement of lithium battery production quality. Utility Model Content

[0004] The purpose of this invention is to overcome the problems of turbulent slurry flow and backflow in the battery production process, which leads to poor coating quality. This invention provides a lithium battery coating pad with a flow guiding and anti-backflow structure, which can improve the quality of lithium battery production.

[0005] To achieve the above objectives, this utility model provides a lithium battery coating pad with a flow guiding and anti-backflow structure, including a pad body. A notch is provided on the side of the pad body. A main slurry guide channel is provided on the side wall of the notch away from the opening of the notch. A plurality of first guide plate groups are provided on the side wall of the main slurry guide channel. Each first guide plate group includes two symmetrically arranged first guide plates. The distance between the ends of the two first guide plates in the same group away from the side wall of the main slurry guide channel is greater than the distance between the other ends close to the side wall of the main slurry guide channel.

[0006] Optionally, the number of the first guide plate groups on the sidewalls of the two main slurry guide channels is equal.

[0007] Optionally, the first guide plate groups on the sidewalls of the two main slurry guide troughs are symmetrically arranged.

[0008] Optionally, the minimum included angle between the first guide plate and the side wall of the main slurry guide trough is in the range of 30 degrees to 60 degrees.

[0009] Optionally, the height of the first guide plate is in the range of 1 / 3 to 1 / 2 of the distance between the two side walls of the main slurry guide channel.

[0010] Optionally, a side slurry guide groove is provided on the side of the gasket body near the opening of the recess. The side wall of the side slurry guide groove is provided with a plurality of anti-backflow protrusions. The end of the anti-backflow protrusion away from the side wall of the side slurry guide groove is away from the feed port of the side slurry guide groove.

[0011] Optionally, the included angle between each of the anti-backflow protrusions and the sidewall of the side slurry guide channel is equal.

[0012] Optionally, the anti-backflow protrusions on the two sidewalls of the notch are arranged symmetrically to each other.

[0013] Optionally, the height of the anti-backflow protrusion ranges from 0.5 mm to 2 mm.

[0014] Optionally, the minimum spacing between adjacent anti-backflow protrusions ranges from 1 mm to 3 mm.

[0015] Through the above technical solution, this utility model provides a lithium battery coating pad with a flow guiding and anti-backflow structure. This lithium battery coating pad guides the orderly flow of the slurry through an "S"-shaped flow guide plate and further improves the uniformity of the slurry through anti-backflow protrusions, thereby improving the consistency of the pad. This addresses the problems of turbulent slurry flow and backflow during battery production, which lead to poor coating quality in existing technologies. It has broad application prospects for coating various high-viscosity, high-flow-rate lithium battery slurries. Attached Figure Description

[0016] Figure 1 This is a plan view of the entire gasket, showing the location of the main slurry guide channel and the side slurry guide channels of the gasket structure; Figure 2 This is a magnified view of a portion of area A regarding the main slurry guide chute, showing the tilt angle and position of the guide plate; Figure 3 This is a magnified view of a section B regarding the side slurry guide channel, highlighting the serrated structure and size proportions of the anti-backflow protrusions.

[0017] Explanation of reference numerals in the attached figures 1. Gasket body; 2. Main slurry guide channel; 21. First guide plate; 210. First guide plate assembly; 3. Side slurry guide channel; 31. Anti-backflow protrusion; 4. Notch. Detailed Implementation

[0018] In this utility model, unless otherwise stated, directional terms such as "away from", "near", "up", "down", "side", and "bottom" generally refer to the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term.

[0019] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope of this utility model.

[0020] like Figure 1 The image shown is a plan view of an integral gasket with a current-guiding and anti-backflow structure for a lithium battery coating, according to one embodiment of the present invention. Figure 1 In this context, the gasket includes a gasket body 1, a notch 4, and a main slurry guide groove 2. Figure 1 Area “A”). The gasket body 1 has a recess 4 on its side, and a main slurry guide channel 2 is located on the side wall of the recess 4 away from its opening. A partial enlarged view of the main slurry guide channel 2 is shown below. Figure 1 See "Area A" Figure 2 ,from Figure 2 As can be clearly seen, the sidewall of the main slurry guide trough 2 is provided with a plurality of first guide plate groups 210. Each first guide plate group 210 includes two symmetrically arranged first guide plates 21, and the distance between the ends of the two first guide plates 210 in the same group that are away from the sidewall of the main slurry guide trough 2 is greater than the distance between the other ends that are close to the sidewall of the main slurry guide trough 2.

[0021] Therefore, through such Figure 1 as well as Figure 2 The integrated structure of the main slurry guide channel and guide plate shown has a first guide plate 21 set on the upper and lower side walls of the main slurry guide channel 2 to realize the orderly flow of the main slurry in the guide channel and effectively avoid the turbulent flow of the slurry in the channel.

[0022] In such Figure 2 In the main slurry guide trough device shown, in order to ensure that the main slurry can flow out at a stable and uniform flow rate after passing through the main slurry guide trough 2, the number of the first guide plate group 210 on the side walls of the upper and lower main slurry guide troughs 2 is equal, so as to ensure that the main slurry flows out at the same speed when passing through the side walls of the upper and lower main slurry guide troughs 2.

[0023] Similarly, in that case Figure 2In the main slurry guide trough device shown, in order to ensure that the main slurry can flow out at a stable flow rate and uniformly after passing through the main slurry guide trough 2, the first guide plate group 210 on the side wall of the two main slurry guide troughs 2 is symmetrically arranged to ensure that the main slurry flows in an orderly manner in the "S"-shaped guide channel, effectively avoiding the turbulent flow of the slurry in the channel.

[0024] In addition, in this case Figure 2 In the main slurry guiding trough device shown, considering the influence of the angle θ between the first guide plate 21 and the side wall of the main slurry guiding trough 2 on the guiding effect during the actual coating process, one embodiment of this utility model adopts a minimum angle range of 30 degrees to 60 degrees between the first guide plate 21 and the side wall of the main slurry guiding trough 2. Within this range, the main slurry can be effectively made to flow in an orderly manner in the main slurry guiding trough 2.

[0025] Furthermore, in this case Figure 2 In the main slurry guiding trough device shown, the height H1 of the first guide plate 21 varies with the distance between the two side walls of the main slurry guiding trough 2. Considering the cost and outflow efficiency in the actual coating process, the height of the first guide plate 21 can be of various types known to those skilled in the art. In one embodiment of this utility model, the height of the first guide plate 21 is in the range of 1 / 3 to 1 / 2 of the distance between the two side walls of the main slurry guiding trough 2.

[0026] With Figure 1 as well as Figure 2 Similar to the integrated structure of the main slurry guide channel and guide plate shown, the gasket body 1 of this utility model has a side slurry guide channel 3 near the opening of the recess 4 on its side. A partial enlarged view of this side slurry guide channel 3 is shown below. Figure 1 See "B" area) Figure 3 The side wall of the side slurry guide trough 3 is provided with multiple anti-backflow protrusions 31. The end of the anti-backflow protrusion 31 away from the side wall of the side slurry guide trough 3 is away from the feed inlet of the side slurry guide trough 3. The feed direction is shown in the figure. Figure 3 .

[0027] Therefore, through such Figure 1 as well as Figure 3 The side slurry guide groove and anti-backflow protrusion shown are integrally molded structures. Anti-backflow protrusions 31 are provided on the upper and lower side walls of the side slurry guide groove 3 to prevent the side slurry from flowing back and improve the coating quality.

[0028] In such Figure 3 In the side slurry guide trough device shown, the included angle between each anti-backflow protrusion 31 and the side wall of the side slurry guide trough 3 is equal, so as to ensure that the side slurry flows out of the side slurry guide trough 3 stably and evenly.

[0029] Similarly, in that case Figure 3 In the side slurry guide trough device shown, regarding the relative positions of the anti-backflow protrusions on the upper and lower side walls of the recess 4, in one embodiment of this utility model, the anti-backflow protrusions 31 on the two side walls of the recess 4 are arranged symmetrically to each other.

[0030] Furthermore, in this case Figure 3 In the side slurry guide trough device shown, considering the actual coating operation process, the height H2 of the anti-backflow protrusion 31 in the side slurry guide trough 3 affects the anti-backflow efficiency of the entire coating operation. The height of the anti-backflow protrusion 31 can be one of many known to those skilled in the art. In one embodiment of this utility model, the height of the anti-backflow protrusion 31 is in the range of 0.5 mm to 2 mm.

[0031] Furthermore, in such a case Figure 3 In the side slurry guide trough device shown, the spacing L1 between adjacent anti-backflow protrusions 31 also has a crucial impact on the anti-backflow design. The size of the spacing L1 between adjacent anti-backflow protrusions 31 can be various that are known to those skilled in the art. In one embodiment of this utility model, the minimum spacing between adjacent anti-backflow protrusions 31 is in the range of 1 mm to 3 mm.

[0032] Through the above technical solution, this utility model provides a lithium battery coating pad with a flow guiding and anti-backflow structure. This lithium battery coating pad guides the orderly flow of the slurry through an "S"-shaped flow guide plate and further improves the uniformity of the slurry through an anti-backflow protrusion structure, thereby improving the consistency of the electrode sheets. This addresses the problems of turbulent slurry flow and backflow during battery production, which lead to poor coating quality in existing technologies. It has broad application prospects for various high-viscosity, high-flow-rate lithium battery slurry coating scenarios.

[0033] The preferred embodiments of this utility model have been described in detail above with reference to the accompanying drawings; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model. For example, in actual installation, the gasket body is aligned with the positioning block of the coating equipment through the positioning groove, and then bolts are used to fix it to the coating die head through the fixing bolt holes. During the coating operation, the main slurry flows in through the main slurry guide channel and flows along an "S"-shaped path under the guidance of the guide plate. The eddies are eliminated, and the flow velocity gradually stabilizes. After the side slurry enters the side slurry guide channel, it can only flow in one direction under the action of the anti-backflow protrusion, avoiding backflow, and is finally evenly coated on the edge of the collector. During the production process, the tilt angle of the guide plate and the size of the anti-backflow protrusion can be adjusted appropriately according to the characteristics of the slurry to achieve the best coating effect. To avoid unnecessary repetition, this utility model will not describe various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed by this utility model and all fall within the protection scope of this utility model.

Claims

1. A lithium battery coating pad with a current-guiding and backflow-preventing structure, characterized in that, The device includes a gasket body, a notch on the side of the gasket body, a main slurry guide channel on the side wall of the notch away from the opening of the notch, and a plurality of first guide plate groups on the side wall of the main slurry guide channel. Each first guide plate group includes two symmetrically arranged first guide plates, and the distance between the ends of the two first guide plates in the same group away from the side wall of the main slurry guide channel is greater than the distance between the other ends of the two first guide plates near the side wall of the main slurry guide channel.

2. The gasket according to claim 1, characterized in that, The number of the first guide plate group on the sidewalls of the two main slurry guide channels is equal.

3. The gasket according to claim 2, characterized in that, The first guide plate groups are symmetrically arranged on the side walls of the two main slurry guide troughs.

4. The gasket according to claim 1, characterized in that, The minimum included angle between the first guide plate and the side wall of the main slurry guide trough ranges from 30 degrees to 60 degrees.

5. The gasket according to claim 1, characterized in that, The height of the first guide plate is between 1 / 3 and 1 / 2 of the distance between the two side walls of the main slurry guide trough.

6. The gasket according to claim 1, characterized in that, A side slurry guide groove is provided on the side of the gasket body near the opening of the recess. The side wall of the side slurry guide groove is provided with multiple anti-backflow protrusions. The end of the anti-backflow protrusion away from the side wall of the side slurry guide groove is away from the feed port of the side slurry guide groove.

7. The gasket according to claim 6, characterized in that, The included angle between each of the anti-backflow protrusions and the sidewall of the side slurry guide channel is equal.

8. The gasket according to claim 6, characterized in that, The anti-backflow protrusions on the two side walls of the notch are symmetrically arranged.

9. The gasket according to claim 6, characterized in that, The height of the anti-backflow protrusion ranges from 0.5 mm to 2 mm.

10. The gasket according to claim 7, characterized in that, The minimum spacing between adjacent anti-backflow protrusions ranges from 1 mm to 3 mm.

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