Online thinning adjustable gasket and coating die head

Abstract

The utility model discloses an on-line thinning adjustable gasket and a coating die head, the on-line thinning adjustable gasket comprises a main gasket, at least two side gaskets and a thinning adjusting structure, the side gaskets extend outwards from the same side of the main gasket at intervals, and a runner is formed between every two adjacent side gaskets; the side wall, close to the flow channel, of at least one side gasket is provided with the thinning adjusting structure, the thinning adjusting structure extends towards the side gasket close to the thinning adjusting structure, and at least part of the thinning adjusting structure is located in the flow channel. And the thinning adjusting structure can linearly move relative to the side gasket close to the thinning adjusting structure so as to change the length of the part, located in the flow channel, of the side gasket. The coating die head comprises the adjustable gasket for wire thinning, and by adopting the adjustable gasket for wire thinning and the coating die head, online adjustment can be carried out in the coating process, and the cost can be reduced while the adjustment range is enlarged.

Description

Technical Field

[0001] The utility model relates to the technical field of coating equipment, in particular to an online thinning adjustable gasket and a coating die head. Background Art

[0002] With the rapid development of lithium batteries, battery capacity and the state of the pole pieces are important technical indicators of batteries. In the production process of lithium batteries, the thinning of the coating edges is an important factor affecting the battery capacity and interface. The main reason is that during the drying process of the wet coating, the coating solvent at the edge will evaporate first and then dry. Due to changes in the concentration and surface tension of the edge coating, the slurry of the intermediate coating will migrate to the edge, eventually causing the edge to bulge after drying, resulting in unqualified pole pieces. At the same time, in order to ensure that the negative electrode is excessive compared to the positive electrode, it is necessary to control the thinning of the positive and negative electrode edges to varying degrees to prevent lithium deposition at the edges of the battery pole pieces.

[0003] At present, in the coating debugging and production process, the coating width and edge thinning layer thickness are generally adjusted by replacing gaskets. This method cannot be adjusted online, and the thinning adjustment range is small, the adjustment method has a large workload, the fault tolerance rate is low and the versatility is low. In addition, if a variety of different gaskets are designed, the cost will inevitably increase. Utility Model Content

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide an online thinning adjustable gasket and a coating die head, which can be adjusted online during the coating process and can increase the adjustment range while reducing costs.

[0005] In order to achieve the above object, the utility model is implemented through the following technical scheme: an online thinning adjustable gasket, comprising:

[0006] Main gasket;

[0007] at least two side gaskets, the side gaskets are spaced apart from each other and extend outward from the same side of the main gasket, and a flow channel is formed between two adjacent side gaskets; and

[0008] A thinning adjustment structure is provided on at least one side wall of each side gasket close to the flow channel, the thinning adjustment structure extends toward the side gasket close thereto, the thinning adjustment structure is at least partially located in the flow channel, and the thinning adjustment structure can move linearly relative to the side gasket close thereto to change the length located in the flow channel.

[0009] Furthermore, the thinning adjustment structure includes a thinning block and a driving member, the driving member is arranged on the side gasket and extends to the outside of the upper die head corresponding thereto, the driving member is connected to the tail end of the thinning block, the front end of the thinning block is the thinning end, the driving member is connected to the rear end of the thinning block, and the driving member can drive the thinning block to move closer to or away from the side gasket adjacent thereto.

[0010] Furthermore, a hollow groove communicating with the flow channel is formed on the side gasket, and the tail end of the thinning block can be slidably disposed in the hollow groove.

[0011] Furthermore, the hollow groove is perpendicular to the adjacent side gasket.

[0012] Furthermore, the driving member includes a rotating rod and a gear, the rotating rod is rotatably arranged on the main gasket, an avoidance hole is opened on the upper die head, the top end of the rotating rod extends out of the avoidance hole, and the other end of the rotating rod extends into the hollow groove, the gear sleeve is fixed on the rotating rod, and the tail end of the thinning block has a tooth track extending axially along the hollow groove, and the gear is engaged with the tooth track.

[0013] Furthermore, the rotating rod is a hexagonal rod.

[0014] Furthermore, the rear end of the thinning block can be slidably and sealingly connected to the inner wall of the hollow groove.

[0015] Furthermore, the thickness of the thinned end of the thinning block is smaller than the thickness of the side gasket.

[0016] Furthermore, the thickness of the rear end of the thinning block is consistent with the thickness of the side gasket.

[0017] A coating die head, comprising:

[0018] An upper die head and a lower die head are arranged opposite to each other and spaced apart; and

[0019] As for the above-mentioned online thinning adjustable gasket, the online thinning adjustable gasket is arranged between the upper die head and the lower die head.

[0020] Beneficial effects of the utility model:

[0021] The above-mentioned online adjustable thinning gasket and coating die head, the online adjustable thinning gasket includes a main gasket, at least two side gaskets and a thinning adjustment structure, the side gaskets are spaced apart and extend outward from the same side of the main gasket, and a flow channel is formed between two adjacent side gaskets; each side gasket is provided with a thinning adjustment structure on at least one side wall close to the flow channel, the thinning adjustment structure extends toward the side gasket close to it, the thinning adjustment structure is at least partially located in the flow channel, and the thinning adjustment structure can move linearly relative to the side gasket close to it to change the length located in the flow channel. The coating die head includes an upper die head, a lower die head and the online adjustable thinning gasket that are arranged oppositely and spaced apart.

[0022] During the coating process, the linear motion of the thinning adjustment structure can be adjusted to adjust the length of the thinning adjustment structure extending into the flow channel, thereby blocking the flow of part of the slurry in the area to achieve the purpose of changing the thickness of the electrode in the area. In this way, since the adjustment range of the thinning amount is larger, the target thinning amount can be easily achieved, thereby greatly improving the probability of passing the test, and it can be directly adjusted during the coating process very conveniently, greatly saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation of the utility model, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0024] Figure 1 A schematic diagram of an online thinning adjustable gasket provided in one embodiment of the utility model;

[0025] Figure 2 for Figure 1 A partial schematic diagram of the

[0026] Reference numerals:

[0027] 100, main gasket; 200, side gasket; 210, hollow groove; 300, thinning adjustment structure; 310, thinning block; 311, thinning end; 312, tooth path; 320, driving member; 321, rotating rod; 322, gear; 400, flow channel. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0029] In the production process of secondary batteries, it is necessary to use a coating machine to evenly, continuously or intermittently coat the prepared viscous paste on the substrate. During the coating process, the slurry is prone to edge effect at the edge where it contacts the gasket in the coating machine, resulting in the thickness of the edge areas on both sides of the coating formed by the slurry being greater than the thickness of the middle area, affecting the use of the battery. Therefore, it is necessary to thin the slurry coating during the coating process.

[0030] At present, in the process of coating debugging and production, the coating width and edge thinning layer thickness are generally adjusted by replacing the gasket. This method cannot be adjusted online. At the same time, the thinning adjustment range is small, the adjustment method has a large workload, low fault tolerance, and low versatility. In addition, if a variety of different gaskets are designed, the cost will inevitably increase. In view of the above problems, the present invention provides an online thinning adjustable gasket and a coating die head to solve the above problems.

[0031] See also Figure 1 to Figure 2 The utility model provides an online thinning adjustable gasket, comprising a main gasket 100, at least two side gaskets 200 and a thinning adjustment structure 300.

[0032] Specifically, the side gaskets 200 are spaced apart from each other and extend outward from the same side of the main gasket 100, and a flow channel 400 is formed between two adjacent side gaskets 200. A thinning adjustment structure 300 is provided on at least one side wall of each side gasket 200 close to the flow channel 400, and extends toward the side gasket 200 close thereto. The thinning adjustment structure 300 is at least partially located in the flow channel 400, and the thinning adjustment structure 300 can move linearly relative to the side gasket 200 close thereto to change the length located in the flow channel 400.

[0033] During the coating process, the linear motion of the thinning adjustment structure 300 can be adjusted to adjust the length of the thinning adjustment structure 300 extending into the flow channel 400, thereby blocking the flow of part of the slurry in the area to achieve the purpose of changing the thickness of the electrode in the area. In this way, since the adjustment range of the thinning amount is larger, the target thinning amount can be easily achieved, thereby greatly improving the probability of passing, and it is very convenient to debug directly during the coating process, which greatly saves costs.

[0034] Specifically, the thinning adjustment structure 300 includes a thinning block 310 and a driving member 320. The driving member 320 is disposed on the side gasket 200 and extends to the outside of the upper die head corresponding thereto. The driving member 320 is connected to the rear end of the thinning block 310. The front end of the thinning block 310 is a thinning end 311. The driving member 320 is connected to the rear end of the thinning block 310. The driving member 320 can drive the thinning block 310 to move closer to or away from the side gasket 200 adjacent thereto.

[0035] When in use, the driving member 320 drives the thinning block 310 to move linearly toward or away from the side gasket 200 adjacent thereto, thereby changing the length of the thinning block 310 inserted into the flow channel 400 .

[0036] Specifically, the side gasket 200 is provided with a hollow groove 210 connected to the flow channel 400, the tail end of the thinning block 310 can be slidably arranged in the hollow groove 210, and the driving member 320 is connected to the tail end of the thinning block 310. When the thickness of the pole piece needs to be reduced, the driving member 320 drives the thinning block 310 to extend outward to block the flow of part of the slurry in the area, thereby achieving the purpose of reducing the thickness of the pole piece in the area. On the contrary, when the thickness of the pole piece needs to be increased, the thinning block 310 needs to be driven backward.

[0037] In order to achieve the adjustment effect, the direction of the hollow groove 210 can be set to be perpendicular to the adjacent side gasket 200. In this way, the thinning block 310 can vertically move the side gasket 200, which can change the flow effect.

[0038] In this embodiment, the driving member 320 includes a rotating rod 321 and a gear 322. The rotating rod 321 is rotatably arranged on the main gasket 100, and an escape hole is provided on the upper die head. The top end of the rotating rod 321 extends out of the escape hole, and the other end of the rotating rod 321 extends into the hollow groove 210. The gear 322 is sleeved and fixed on the rotating rod 321, and the tail end of the thinning block 310 is provided with a tooth track 312 extending axially along the hollow groove 210, and the gear 322 is meshed with the tooth track 312.

[0039] When in use, the rotating rod 321 only needs to be rotated by a wrench or other means to rotate the gear 322, thereby driving the entire thinning block 310 to move in a telescopic manner.

[0040] Of course, in other implementation methods, the driving member 320 can be another linear motion mechanism, such as an electric push rod, or a toggle rod, which is hinged on the side gasket 200, one end of the toggle rod is connected to the thinning block 310, and the other end extends from the upper die head. Driving the toggle rod can also drive the thinning block 310 to telescopic movement.

[0041] In a specific implementation, the rotating rod 321 can be a hexagonal rod to facilitate the rotation of the wrench.

[0042] In addition, the rear end of the thinning block 310 can be slidably and sealedly connected to the inner wall of the hollow groove 210, so that the side wall of the hollow groove 210 can guide the thinning block 310 and facilitate the movement of the thinning block 310.

[0043] In addition, the thickness of the thinned end 311 of the thinned block 310 can be made smaller than the thickness of the side gasket 200. The thickness of the rear end of the thinned block 310 is consistent with the thickness of the side gasket 200, which can ensure that the upper and lower dies are completely closed when closed, preventing the slurry from penetrating into the hollow groove 210 and affecting the adjustment.

[0044] In addition, the utility model also provides a coating die head, which includes an upper die head and a lower die head that are arranged oppositely and at intervals; and includes the above-mentioned online thinning adjustable gasket, which is arranged between the upper die head and the lower die head.

[0045] Adopt coating die head: Due to the length of the thinning adjustment structure 300 extending into the flow channel 400, the flow rate of part of the slurry in this area is changed. At the same time, due to the wider adjustment range of the thinning amount, the target thinning amount can be easily achieved, thereby greatly improving the probability of qualified products. Moreover, it is very convenient to debug directly during the coating process, which greatly saves costs and is easy to use, greatly improving production efficiency.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. An online thinning adjustable gasket, characterized in that: include: Main gasket; at least two side gaskets, the side gaskets are spaced apart from each other and extend outward from the same side of the main gasket, and a flow channel is formed between two adjacent side gaskets; and A thinning adjustment structure is provided on at least one side wall of each side gasket close to the flow channel, the thinning adjustment structure extends toward the side gasket close thereto, the thinning adjustment structure is at least partially located in the flow channel, and the thinning adjustment structure can move linearly relative to the side gasket close thereto to change the length located in the flow channel.

2. The online thinning adjustable gasket according to claim 1, characterized in that: The thinning adjustment structure includes a thinning block and a driving member, wherein the driving member is arranged on the side gasket and extends to the outside of the corresponding upper die head, the driving member is connected to the tail end of the thinning block, the front end of the thinning block is the thinning end, the driving member is connected to the rear end of the thinning block, and the driving member can drive the thinning block to move closer to or away from the side gasket adjacent to it.

3. The online thinning adjustable gasket according to claim 2, characterized in that: The side gasket is provided with a hollow groove communicated with the flow channel, and the tail end of the thinning block can be slidably arranged in the hollow groove.

4. The online thinning adjustable gasket according to claim 3, characterized in that: The hollow groove is perpendicular to the side gasket adjacent to it.

5. The online thinning adjustable gasket according to claim 3, characterized in that: The driving member includes a rotating rod and a gear. The rotating rod is rotatably arranged on the main gasket. An avoidance hole is opened on the upper die head. The top end of the rotating rod extends out of the avoidance hole, and the other end of the rotating rod extends into the hollow groove. The gear sleeve is fixed on the rotating rod. The tail end of the thinning block has a tooth track extending axially along the hollow groove, and the gear is meshed with the tooth track.

6. The online thinning adjustable gasket according to claim 5, characterized in that: The rotating rod is a hexagonal rod.

7. The online thinning adjustable gasket according to claim 5, characterized in that: The rear end of the thinning block is slidably and sealingly connected to the inner wall of the hollow groove.

8. The online thinning adjustable gasket according to claim 2, characterized in that: The thickness of the thinned end of the thinned block is smaller than the thickness of the side gasket.

9. The online thinning adjustable gasket according to claim 2, characterized in that: The thickness of the rear end of the thinning block is consistent with the thickness of the side gasket.

10. A coating die head, characterized in that: include: An upper die head and a lower die head are arranged oppositely and at intervals; and The online thinning adjustable gasket according to any one of claims 1 to 9, wherein the online thinning adjustable gasket is arranged between the upper die head and the lower die head.

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