Coating gasket, coating die head and coating machine

Abstract

The utility model discloses a coating gasket, a coating die head and a coating machine. The coating gasket comprises a main flow blocking section, a first flow blocking section and a second flow blocking section, the two side flow blocking sections extend out of the two ends of the main flow blocking section in the same direction respectively, and the outer ends of the two side flow blocking sections are bent oppositely to form a flow guide groove; and each chamfering sheet is rotatably installed at the outer end of the corresponding side flow blocking section and located at the corner position of the outlet of the flow guide groove, and a plurality of chamfers of different sizes are arranged on the periphery of each chamfering sheet. According to the technical scheme provided by the utility model, the universality of the coating gasket is improved, and the coating gasket can switch chamfers with different sizes so as to cope with coating conditions with different edge bulging degrees.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery slurry coating, in particular to a coating gasket, a coating die head and a coating machine. Background Art

[0002] The manufacturing process of lithium-ion batteries mainly includes slurry preparation, slurry coating, drying, cutting, winding, packaging and other processes. Among them, slurry coating is an important process in the manufacture of lithium-ion batteries, and its main purpose is to evenly coat the slurry on the positive and negative electrodes of the battery. There are many ways to coat the slurry, one of which is slit extrusion coating, that is, the slurry is squeezed out from the slit of the coating die and coated on the battery cell electrode. The coating die generally includes an upper die and a lower die, and a coating gasket is sandwiched between the upper die and the lower die, forming a slit for the slurry to flow out.

[0003] Due to the requirements of different battery cell performance, the characteristics of the slurry are different. When the slurry is coated on the battery cell electrode, there is a large thickness at the edge of the coating, forming the so-called drum edge phenomenon. At present, a coating gasket with a chamfered design for the slurry opening is generally used to optimize the outlet shape of the coating gasket, change the slurry flow direction and speed, reduce the stress state of the edge slurry, and enhance the thinning effect of the edge slurry, thereby weakening or even eliminating the coating drum edge phenomenon. However, the chamfer size of the coating gasket is generally fixed. When encountering coating situations with different degrees of drum edges, it is necessary to replace the coating gasket with chamfers of different sizes, which has poor versatility. Utility Model Content

[0004] The main purpose of the utility model is to provide a coating gasket to improve the versatility of the coating gasket and realize a coating gasket that can switch chamfers of different sizes to cope with coating conditions of different drum edge degrees.

[0005] To achieve the above object, the utility model provides a coated gasket, which comprises:

[0006] Main flow blocking section;

[0007] Two side flow blocking sections extend in the same direction from two ends of the main flow blocking section respectively, and the outer ends of the two side flow blocking sections are bent toward each other to form a guide groove;

[0008] Two chamfered pieces, each of which is rotatably mounted on the outer end of one of the side baffle sections and located at the corner of the outlet of the guide groove, and the periphery of the chamfered piece is provided with a plurality of chamfers of different sizes.

[0009] In some embodiments, a mounting groove is concavely formed on the surface of the side baffle section, the chamfered piece is disposed in the mounting groove, and a side wall of the mounting groove is provided with a notch for exposing at least one chamfer of the chamfered piece.

[0010] In some embodiments, a mounting shaft is disposed in the mounting groove, and the chamfered piece is sleeved on the mounting shaft and can rotate around the axis of the mounting shaft.

[0011] In some embodiments, a retractable positioning member is provided on one of the chamfered piece and the side wall of the mounting groove, and a positioning groove matched with the positioning member is provided on the other of the chamfered piece and the positioning member is used to be inserted into the positioning groove to position the chamfered piece;

[0012] There are several positioning members and one positioning groove; or there is one positioning member and several positioning grooves.

[0013] In some embodiments, the positioning member is connected to an elastic member, and the elastic member is used to apply an elastic force to the positioning member to reset it.

[0014] In some embodiments, the chamfered piece is detachably connected to the mounting shaft.

[0015] In some embodiments, the two side flow blocking sections are symmetrically arranged at two ends of the main flow blocking section.

[0016] In some embodiments, the main baffle section is provided with a plurality of first mounting holes; and / or,

[0017] The side baffle section is provided with a plurality of second mounting holes.

[0018] The utility model also provides a coating die head, which comprises a lower die head, an upper die head connected to the lower die head and a coating gasket as described above, wherein the coating gasket is arranged between the upper die head and the lower die head.

[0019] The utility model also provides a coating machine, which comprises the coating die head as described above.

[0020] In the technical solution of the utility model, the coating gasket is provided with a rotatable chamfering piece, and the periphery of the chamfering piece is provided with a plurality of chamfers of different sizes. When encountering coating conditions with different degrees of drum edge, the chamfering piece can be switched to the chamfer of the corresponding size by rotating the chamfering piece to improve the coating drum edge problem, thereby eliminating the need to replace the coating gasket, saving the coating gasket replacement time, improving production efficiency, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a coating gasket in one embodiment of the utility model;

[0022] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0023] Figure 3 for Figure 1 A schematic structural diagram of the chamfered sheet of the coating gasket in the embodiment;

[0024] Figure 4 This is a structural schematic diagram of a portion of a coating gasket in one embodiment of the utility model;

[0025] Figure 5 This is a structural schematic diagram of another part of the coating gasket in one embodiment of the utility model;

[0026] Description of Figure Numbers:

[0027] Label name Label name 100 Main flow block 220 Install the shaft 200 Side baffle section 10 Positioning parts 300 Chamfer 20 Positioning slot D Diversion trough 30 Sliding part R Chamfer 1 First mounting hole 210 Mounting slot 2 Second mounting hole

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0032] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] The embodiment of the utility model provides a coating gasket, which can switch chamfers of different sizes to cope with coating conditions of different rim degrees, thereby improving versatility.

[0034] Reference Figures 1 to 3 The coating gasket of this embodiment includes a main baffle section 100, two side baffle sections 200 and two chamfered pieces 300. The two side baffle sections 200 extend in the same direction from both ends of the main baffle section 100 respectively, and the outer ends of the two side baffle sections 200 are bent toward each other to form a guide groove D; each chamfered piece 300 is rotatably installed on the outer end of a side baffle section 200 and is located at the corner position of the outlet of the guide groove D, and the periphery of the chamfered piece 300 is provided with a plurality of chamfers R of different sizes.

[0035] In this embodiment, the coating gasket is used in the coating process of the lithium battery and is a component used to control the shape of the coating flow channel. The coating gasket can be made of stainless steel or other metal materials. The coating gasket is assembled between the coating upper die head and the lower die head to form a slit between the upper die head and the lower die head. The slurry flows out of the slit under the action of external pressure and covers the surface of the lithium battery pole piece, thereby coating the pole piece.

[0036] The coating gasket of this embodiment includes a main baffle section 100 and two side baffle sections 200, and the two side baffle sections 200 extend from the two ends of the main baffle section 100 in the same direction, and each side baffle section 200 is set at an angle to the main baffle section 100. Exemplarily, the two side baffle sections 200 are perpendicular to the main baffle section 100. The outer ends of the two side baffle sections 200 are bent toward each other, and a guide groove D is formed in the interval area between the bent parts, and the groove width of the guide groove D is the opening length of the coating die slit. Among them, the guide groove D opens at one end facing the enclosed area of ​​each baffle section as an inlet, and the guide groove D opens at one end away from the enclosed area of ​​each baffle section as an outlet. During coating, the slurry flows into the guide groove D from the inlet, and after flowing through the guide groove D, it flows out through the outlet to be coated on the battery cell electrode.

[0037] In the prior art, the chamfer size of the coating gasket is generally fixed. When encountering coating situations with different degrees of drum edge, it is necessary to replace the coating gasket with chamfers of different sizes, which has poor versatility.

[0038] To this end, the coating gasket of the present embodiment further includes two chamfered pieces 300, each of which is rotatably mounted on the outer end of a side baffle section 200 and is located at the corner position of the outlet of the guide groove D. The chamfered piece 300 forms a chamfer R at the corner position of the outlet of the guide groove D, which can optimize the outlet shape of the guide groove D of the coating gasket, change the slurry flow direction and speed, reduce the stress state of the edge slurry, enhance the thinning effect on the edge slurry, and thus weaken or even eliminate the coating drum edge phenomenon.

[0039] The chamfered sheet 300 is provided with a plurality of chamfers R of different sizes on its periphery, and the plurality of chamfers R are provided one by one along the periphery of the chamfered sheet 300. Optionally, the chamfers R are chamfers. The size of each chamfer R can be set according to actual conditions, for example, Figure 3 As shown, the chamfered sheet 300 is an irregular rhombus sheet, and the plurality of chamfers R include 2mm, 3mm, and 4mm slope chamfers, and each slope chamfer is provided with two and is symmetrically arranged about the center of the chamfered sheet 300. Of course, this is only exemplary and not restrictive. By rotating the chamfered sheet 300 to adjust its angular position, the chamfer R exposed at the corner position of the outlet of the guide groove D of the chamfered sheet 300 can be switched to change the chamfer size of the coating gasket. In addition, the chamfered sheet 300 can be made of stainless steel or other metal materials.

[0040] Therefore, in this embodiment, when encountering coating situations with different degrees of drum edges, the chamfer R of the corresponding size can be switched by rotating the chamfer piece 300 to improve the coating drum edge problem, thereby eliminating the need to replace the coating gasket, saving the coating gasket replacement time, improving production efficiency, and reducing production costs.

[0041] In some embodiments, reference Figure 4 and Figure 5 , the surface of the side baffle section 200 is concavely provided with a mounting groove 210, and the chamfered piece 300 is arranged in the mounting groove 210, and the side wall of the mounting groove 210 is provided with a notch for exposing at least one chamfer of the chamfered piece 300. In this embodiment, the chamfered piece 300 is installed in the mounting groove 210 of the side baffle section 200 in an inlaid manner, and at least one chamfer of the chamfered piece 300 is exposed from the notch of the mounting groove 210, so as to guide the flow of the slurry, reduce the thickness of the edge slurry, and improve the coating drum edge phenomenon. Among them, the chamfered piece 300 can be rotated in the mounting groove 210 to switch to the chamfer R exposed by the notch, thereby changing the chamfer size of the coating gasket. Optionally, the thickness of the chamfered piece 300 is the same as the groove depth of the mounting groove 210. When the chamfered piece 300 is installed in the mounting groove 210, it is flush with the surface of the side baffle section 200. In this way, the chamfered piece 300 can be prevented from interfering with other structures.

[0042] In some embodiments, reference Figure 4 and Figure 5 , a mounting shaft 220 is provided in the mounting groove 210, and the chamfered piece 300 is sleeved on the mounting shaft 220 and can rotate around the axis of the mounting shaft 220. Specifically, a shaft mounting hole is provided on the bottom wall of the mounting groove 210, and the mounting shaft 220 is inserted into the shaft mounting hole for fixing. Optionally, the mounting shaft 220 and the shaft mounting hole are interference fit. A connecting hole adapted to the mounting shaft 220 is configured on the chamfered piece 300, and the chamfered piece 300 is sleeved on the mounting shaft 220 through the connecting hole, and the mounting shaft 220 penetrates into the connecting hole of the chamfered piece 300, and the chamfered piece 300 can rotate around its axis on the mounting shaft 220.

[0043] In some embodiments, reference Figures 2 to 4 A retractable positioning member 10 is provided on one of the side walls of the chamfered sheet 300 and the mounting groove 210, and a positioning groove 20 adapted to the positioning member 10 is provided on the other side wall. The positioning member 10 is used to be inserted into the positioning groove 20 to position the chamfered sheet 300;

[0044] There are several positioning members 10 and one positioning groove 20; or there is one positioning member 10 and several positioning grooves 20.

[0045] In this embodiment, the chamfered sheet 300 may be provided with a retractable positioning member 10, and the side wall of the mounting groove 210 may be provided with a positioning groove 20; or the side wall of the mounting groove 210 may be provided with a retractable positioning member 10, and the chamfered sheet 300 may be provided with a positioning groove 20. In addition, there may be a plurality of positioning members 10, and there may be only one positioning groove 20. For example, the chamfered sheet 300 may be provided with three positioning members 10, which are arranged along the circumference of the chamfered sheet 300 and can extend or retract from the side wall of the chamfered sheet 300, and there is a positioning groove 20 on the side wall of the mounting groove 210. When the chamfered sheet 300 is switched to chamfers of different sizes, the corresponding positioning member 10 is inserted into the positioning groove 20 to fix the chamfered sheet 300. It is also possible that there is only one positioning member 10 and there are multiple positioning grooves 20. For example, three positioning grooves 20 are provided on the chamfered piece 300, and the three positioning grooves 20 are arranged along the circumference of the chamfered piece 300, and a positioning member 10 is provided on the side wall of the mounting groove 210. The positioning member 10 can extend or retract from the side wall of the mounting groove 210. When the chamfered piece 300 is switched to chamfers of different sizes, the positioning member 10 is inserted into the corresponding positioning groove 20 to fix the chamfered piece 300.

[0046] The chamfering piece 300 is inserted into the positioning groove 20 by the positioning member 10 for positioning, and then locked to restrict rotation. When the chamfer R needs to be switched, the positioning member 10 is retracted and removed from the positioning groove 20 to unlock the chamfering piece 300, so that the chamfering piece 300 can be rotated to switch the chamfer R; after the chamfer R is switched, the positioning member 10 is extended and inserted into the positioning groove 20 to lock the chamfering piece 300, so that the chamfering piece 300 is fixed and cannot rotate.

[0047] In some embodiments, the positioning member 10 is connected to an elastic member (not shown), and the elastic member is used to apply an elastic force to the positioning member 10 to reset it. In this embodiment, the elastic member can be a spring, one end of the positioning member 10 is an insertion end for inserting into the positioning groove 20, and the spring is pressed against the other end of the positioning member 10 to provide elastic force for the positioning member 10. Under the elastic force applied by the elastic member, the positioning member 10 is stably inserted into the positioning groove 20, which can prevent the positioning member 10 from falling out of the positioning groove 20, thereby ensuring the positioning effect.

[0048] In some embodiments, the chamfered sheet 300 is detachably connected to the mounting shaft 220. In this embodiment, the manner in which the chamfered sheet 300 is detachably connected to the mounting shaft 220 includes a magnetic connection, a snap connection, etc., which are not limited. For example, the mounting shaft 220 is made of a metal material that can be magnetically attracted, such as iron, and a magnet block is provided on the wall of the connecting hole of the chamfered sheet 300 for the mounting shaft 220 to pass through. When the chamfered sheet 300 is sleeved on the mounting shaft 220, it is magnetically connected to the mounting shaft 220 through the magnet block. Of course, this is merely exemplary and not restrictive. The chamfered sheet 300 of this embodiment is detachable, so the chamfered sheet 300 can be replaced with a chamfered sheet 300 of other sizes to cope with more coating conditions with different degrees of drum edge, further improving the versatility of the coating gasket.

[0049] In some embodiments, reference Figure 1 The two side flow blocking sections 200 are symmetrically arranged at both ends of the main flow blocking section 100. In this embodiment, the two side flow blocking sections 200 are symmetrically arranged at both ends of the main flow blocking section 100, and form a U-shaped coating gasket with the main flow blocking section 100.

[0050] In some embodiments, reference Figure 1, a plurality of first mounting holes 1 are provided on the main baffle section 100; and / or, a plurality of second mounting holes 2 are provided on the side baffle section 200. In this embodiment, the first mounting holes 1 and the second mounting holes 2 are used to mount the coating gasket on the coating die head. Specifically, the coating die head includes an upper die head and a lower die head, and the upper die head and the lower die head are provided with connecting holes that match the first mounting holes 1 on the main baffle section 100, and then the coating gasket arranged between the upper die head and the lower die head is fixed by passing the screws arranged in the connecting holes through the first mounting holes 1 of the main baffle section 100. And / or, the upper die head and the lower die head are provided with connecting holes that match the second mounting holes 2 on the side baffle section 200, and then the coating gasket arranged between the upper die head and the lower die head is fixed by passing the screws arranged in the connecting holes through the second mounting holes 2 of the side baffle section 200.

[0051] The utility model also provides a coating die head, which includes a lower die head, an upper die head connected to the lower die head, and a coating gasket as described in the above embodiment, and the coating gasket is arranged between the upper die head and the lower die head. The specific structure of the coating gasket refers to the above embodiment. Since the coating die head adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0052] The utility model also provides a coating machine, which includes a coating die head as described in the above embodiment. The specific structure of the coating die head refers to the above embodiment. Since the coating machine adopts all the technical solutions of all the above embodiments, it at least has all the technical effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0053] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A coated gasket, characterized in that: include: Main flow blocking section; Two side flow blocking sections extend in the same direction from two ends of the main flow blocking section respectively, and the outer ends of the two side flow blocking sections are bent toward each other to form a guide groove; Two chamfered pieces, each of which is rotatably mounted on the outer end of one of the side baffle sections and located at the corner of the outlet of the guide groove, and the periphery of the chamfered piece is provided with a plurality of chamfers of different sizes.

2. The coated gasket according to claim 1, characterized in that: The surface of the side baffle section is concavely provided with a mounting groove, the chamfered piece is arranged in the mounting groove, and the side wall of the mounting groove is provided with a notch for exposing at least one chamfer of the chamfered piece.

3. The coated gasket according to claim 2, characterized in that: A mounting shaft is arranged in the mounting groove, and the chamfered piece is sleeved on the mounting shaft and can rotate around the axis of the mounting shaft.

4. The coated gasket according to claim 2 or 3, characterized in that: A retractable positioning member is provided on one of the chamfered piece and the side wall of the mounting groove, and a positioning groove matched with the positioning member is provided on the other of the chamfered piece and the positioning member is used to be inserted into the positioning groove to position the chamfered piece; There are several positioning members and one positioning groove; or there is one positioning member and several positioning grooves.

5. The coated gasket according to claim 4, characterized in that: The positioning member is connected to an elastic member, and the elastic member is used to apply an elastic force to the positioning member to reset it.

6. The coated gasket according to claim 3, characterized in that: The chamfered piece is detachably connected to the mounting shaft.

7. The coated gasket according to claim 1, characterized in that: The two side flow blocking sections are symmetrically arranged at two ends of the main flow blocking section.

8. The coated gasket according to claim 1, characterized in that: The main baffle section is provided with a plurality of first mounting holes; and / or, The side baffle section is provided with a plurality of second mounting holes.

9. A coating die head, characterized in that: It comprises a lower die head, an upper die head connected to the lower die head, and a coating gasket as claimed in any one of claims 1 to 8, wherein the coating gasket is arranged between the upper die head and the lower die head.

10. A coating machine, characterized in that: Comprising the coating die as described in claim 9.

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