Coating gasket and coating device

Abstract

The utility model relates to a coating gasket and a coating device, the coating gasket comprises a gasket frame body, the gasket frame body is provided with a slurry flow channel, and one side of the gasket frame body is provided with a slurry outlet communicated with the slurry flow channel; and the stirring mechanism is mounted on the gasket frame body, and the stirring mechanism is accommodated in the coating die head cavity. The stirring mechanism is arranged in the slurry flow channel area of the gasket, so that uniform distribution of slurry entering the slurry flow channel is facilitated, and the pressure of each part in the die head cavity is kept consistent. Furthermore, the pressure of the slurry at the slurry outlet of the gasket frame tends to be consistent, so that the problems of non-uniform surface density distribution and inconsistent film surface quality in the coating process caused by non-uniform pressure of the slurry at each part of the die head in the related technology are solved.

Description

Technical Field

[0001] The present application relates to the field of battery production technology, and in particular to a coating gasket and a coating device. Background Art

[0002] The coating process is crucial in the manufacturing of battery electrodes and is one of the most important steps in determining the quality of the electrodes and finished batteries. The coating process involves applying a prepared slurry to the current collector and drying it in an oven to create an electrode with a specific surface density.

[0003] Among various coating methods, extrusion coating is the most widely used due to its high stability and high efficiency. Extrusion coating processes typically require a die head, which has a concentrated slurry inlet flow and a narrow, long slurry outlet. As the slurry enters the die head and flows out, the pressure at each location is uneven, which can lead to uneven surface density distribution and inconsistent film quality during the coating process. Summary of the Invention

[0004] The present application provides a coating gasket and a coating device, which can solve the problem in the related art that in the process of extrusion coating from the inlet to the outlet, the pressure of the slurry at different places is uneven, which leads to uneven surface density distribution and inconsistent film surface quality during the coating process.

[0005] In a first aspect, an embodiment of the present application provides a coating gasket, comprising: a gasket frame, the gasket frame having a slurry flow channel, and one side of the gasket frame having a slurry outlet connected to the slurry flow channel; a stirring mechanism, the stirring mechanism being installed on the gasket frame, and the stirring mechanism being accommodated in the slurry flow channel.

[0006] In combination with the first aspect, in one embodiment, the slurry flow channel is provided with a spoiler strip, and the stirring mechanism is fixed to the spoiler strip.

[0007] In combination with the first aspect, in one embodiment, a connecting member is installed on the spoiler strip; a first turbine is hinged to the connecting member, and the first turbine is located on one side of the spoiler strip.

[0008] In combination with the first aspect, in one embodiment, the stirring mechanism further includes a driving mechanism, which is installed on the spoiler strip and is detachably connected to a second turbine, which is located on a side of the spoiler strip close to the slurry outlet.

[0009] In combination with the first aspect, in one embodiment, the driving mechanism is closer to the slurry outlet than the second turbine, and a flow sensing device is installed on the side of the driving mechanism away from the second turbine, and the flow sensing device is signal-connected to the driving mechanism.

[0010] In combination with the first aspect, in one embodiment, a plurality of stirring mechanisms are provided, and the plurality of stirring mechanisms are arranged at intervals along the length direction of the spoiler strip.

[0011] In combination with the first aspect, in one embodiment, the gasket frame includes a crossbeam, short beams are fixed at both ends of the crossbeam, the crossbeam and the short beams at both ends together form the slurry flow channel, and the two ends of the spoiler are respectively fixed to the short beams at both ends of the crossbeam.

[0012] In combination with the first aspect, in one embodiment, the gasket frame further includes a blank area, the blank area is fixed to the cross beam, the blank area is arranged between the short beams at both ends, and the blank area and the short beam extend toward the same side; the blank area divides the slurry flow channel into a plurality of grooves, and the stirring mechanism is installed in each of the grooves.

[0013] In the second aspect, an embodiment of the present application provides a coating device, which includes a coating gasket as described above, and the coating device also includes: a die head, the die head having a slurry cavity, and the gasket frame is installed in the slurry cavity; the die head has a slurry inlet and a slurry outlet, the slurry inlet and the slurry outlet are both connected to the slurry cavity, and the slurry outlet of the gasket frame is arranged opposite the slurry outlet of the die head.

[0014] In combination with the second aspect, in one embodiment, the gasket frame is connected to a spoiler strip, the spoiler strip is hinged to a first turbine, and the spoiler strip is connected to a driving mechanism, the driving mechanism is connected to a second turbine, the second turbine is arranged on the side of the spoiler strip close to the slurry outlet, and the first turbine is arranged on the side of the spoiler strip close to the slurry inlet.

[0015] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0016] By setting a stirring mechanism in the slurry flow channel, the slurry entering the slurry flow channel can be distributed as evenly as possible, so that the pressure at various points in the slurry flow channel can be kept as consistent as possible, and the pressure of the slurry flowing out from various positions of the slurry outlet of the gasket frame can also be kept as consistent as possible, solving the problem of uneven pressure of the slurry at various points of the die head in the related technology, which in turn leads to uneven surface density distribution and inconsistent film surface quality during the coating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic diagram of the partial structure of the coating gasket provided in an embodiment of the present application.

[0019] In the picture:

[0020] 11. Horizontal beam; 12. Short beam; 13. Blank area;

[0021] 21. Connecting member; 22. First turbine; 23. Driving mechanism; 24. Second turbine; 25. Flow sensing device;

[0022] 3. Spoiler strip. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The embodiment of the present application provides a coating gasket, which can solve the problems of uneven pressure of the slurry at different locations during the extrusion coating process from the inlet to the outlet in the related art, which may lead to uneven surface density distribution and inconsistent film surface quality during the coating process.

[0025] See also Figure 1 The figure shows a partial structural diagram of a coating gasket provided in an embodiment of the present application, which may include: a gasket frame, the gasket frame having a slurry flow channel, and one side of the gasket frame having a slurry outlet connected to the slurry flow channel, and the slurry in the slurry flow channel flows out from the slurry outlet; a stirring mechanism, the stirring mechanism is installed on the gasket frame, and the stirring mechanism is accommodated in the slurry flow channel, the stirring mechanism may be connected to the gasket frame, and the stirring mechanism is accommodated in the slurry flow channel, which can make the slurry pressure at each position in the slurry flow channel as consistent as possible by stirring.

[0026] The embodiment of the present application provides a stirring mechanism in the slurry flow channel, so that the slurry entering the slurry flow channel can be distributed as evenly as possible. The gasket frame can be placed in the cavity of the die head, and the cavity of the die head is connected to the slurry flow channel. When the slurry flows in from the inlet of the die head, due to the narrow inlet and the long and narrow outlet, as the slurry continuously enters during the coating process, the slurry pressure near the inlet in the cavity and the slurry flow channel is greater than the slurry pressure at the outlet. After the slurry at various locations in the slurry flow channel is stirred as evenly as possible, the pressure of the slurry in the slurry flow channel at various locations in the slurry flow channel can also be kept consistent as much as possible, which means that the slurry pressure flowing out of various positions of the slurry outlet of the gasket frame can also be kept consistent as much as possible. When the slurry flows from the slurry outlet to the outlet of the die head and is finally coated on the current collector, the coating thickness at various positions on the current collector can also be kept consistent as much as possible, which solves the problem of uneven pressure of the slurry at various locations of the die head in the related art, which in turn leads to uneven surface density distribution and inconsistent membrane surface quality during the coating process.

[0027] In some optional embodiments, the slurry flow channel is provided with a spoiler strip 3, and the stirring mechanism is fixed to the spoiler strip 3. The spoiler strip 3 can play a certain disturbing role on the slurry in the slurry flow channel. When the slurry entering from the inlet touches the spoiler strip 3 under strong pressure, part of the slurry can be disturbed and flow toward the side of the spoiler strip 3, thereby adjusting the pressure of the slurry close to the side of the spoiler strip 3. Fixing the stirring mechanism to the spoiler strip 3 can make the stirring mechanism contact the slurry as much as possible and better stir the slurry.

[0028] In some optional embodiments, the stirring mechanism may include: a connecting member 21, the connecting member 21 is mounted on the spoiler strip 3, the connecting member 21 may be fixed on the spoiler strip 3, or may be detachably connected to the spoiler strip 3; a first turbine 22, the first turbine 22 is hinged to the connecting member 21, and the first turbine 22 is located on one side of the spoiler strip 3. In the embodiment of the present application, after the first turbine 22 is hinged to the connecting member 21, it can rotate nearly three hundred and sixty degrees around the axis of the connecting member 21. Preferably, the connecting member 21 is set to have a certain length so that the interference of the spoiler strip 3 on the first turbine 22 can be minimized during the rotation of the first turbine 22. Preferably, the first turbine 22 is detachably hinged to the connecting member 21, so that the first turbine 22 can be removed from the connecting member 21 for cleaning, and the drive of the first turbine 22 can be driven by the fluidity of the slurry itself.

[0029] In some optional embodiments, the stirring mechanism further includes a driving mechanism 23, the driving mechanism 23 is mounted on the spoiler bar 3, and the driving mechanism 23 is detachably connected to a second turbine 24, the second turbine 24 is located on the side of the spoiler bar 3 close to the slurry outlet, it should be understood that the second turbine 24 can also be driven to adjust the pressure of the slurry on its peripheral side, in the embodiment of the present application, the second turbine 24 is located on the side of the spoiler bar 3 close to the slurry outlet, at this position, the fluidity of the slurry itself may not be enough to drive the second turbine 24 to rotate, so the second turbine 24 is connected to the driving mechanism 23 so that the driving mechanism 23 can drive the second turbine 24 to rotate, thereby stirring the slurry on the peripheral side of the second turbine 24. Preferably, the driving mechanism 23 can be a driving motor, and the second turbine 24 is detachably connected to the shaft of the driving motor, which can also facilitate the removal and cleaning of the second turbine 24. By providing the second turbine 24, the slurry near the slurry outlet can be further stirred, so that the slurry pressure at each point in the slurry flow channel can be more consistent as much as possible.

[0030] In some optional embodiments, the driving mechanism 23 is closer to the slurry outlet than the second turbine 24, and a flow sensing device 25 is installed on the side of the driving mechanism 23 away from the second turbine 24. The flow sensing device 25 is signal-connected to the driving mechanism 23, that is, the flow sensing device 25 is arranged near the slurry outlet, and is used to sense the flow of the slurry near the slurry outlet. The flow sensing device 25 can be a flow meter. When the flow meter measures that the slurry flow rate on its periphery is large, it will transmit the detected signal to the circuit board in the stirring mechanism, and the circuit board will control the operation of the driving mechanism 23. The driving mechanism 23 then drives the second turbine 24 to rotate and adjust the slurry flow rate on its periphery, and the second turbine 24 is driven by the driving mechanism 23 to facilitate the adjustment of the speed or rotation direction of the second turbine 24, that is, to facilitate the adjustment of the speed or rotation direction of the second turbine 24 according to the value monitored by the flow sensing device 25, thereby further improving the flow consistency of the slurry near the slurry outlet.

[0031] In some optional embodiments, the stirring mechanism is provided with a plurality of, and a plurality of the stirring mechanisms are spaced apart along the length direction of the spoiler strip 3. According to the size of the die head, the required gasket frame size is also different. When the gasket frame is large, a plurality of stirring mechanisms can be provided so that the slurry in the larger slurry flow channel can flow as much as possible under the action of the stirring mechanism, thereby adjusting the pressure of the slurry at various locations. Preferably, the flow sensing devices 25 in each stirring mechanism are all signal-connected. When the values ​​monitored in each flow sensing device 25 are roughly the same, the driving mechanism 23 can stop working, which can save some driving power and extend the service life of the stirring mechanism. In the embodiment of the present application, each flow sensing device 25 in a plurality of stirring mechanisms can be independently arranged, that is, not connected to each other. At this time, a flow value can be set in each flow sensing device 25. When the sensing value of the flow sensing device 25 is greater than the set flow value, the motor reverses to reduce the flow, and vice versa. It should be understood that the set flow values ​​of each flow sensing device 25 can be the same. At this time, the flow rates in each area of ​​the slurry flow channel can be kept consistent as much as possible. In some cases, a thinning area needs to be set in the coating gasket. At this time, different flow values ​​can be set in the flow sensing device 25 according to the different flow rates required in various places in the slurry flow channel.

[0032] In some optional embodiments, the gasket frame includes a crossbeam 11, and short beams 12 are respectively fixed at both ends of the crossbeam 11. The crossbeam 11 and the short beams 12 at both ends together form the slurry flow channel, and the two ends of the spoiler strip 3 are respectively fixed to the short beams 12 at both ends of the crossbeam 11. In the implementation of this application, the crossbeam 11 and the short beams 12 at both ends form a trough body with an opening, which is also the slurry flow channel. The spoiler strip 3 can be arranged parallel to the crossbeam 11, and the slurry can have a certain uniform flow effect when passing through the spoiler strip 3.

[0033] In some optional embodiments, the gasket frame also includes a blank area 13, the blank area 13 is fixed to the cross beam 11, and the blank area 13 is arranged between the two short beams 12. Specifically, the blank area 13 between the two short beams 12 can be multiple, that is, multiple blank areas 13 are arranged at intervals between the two short beams 12, and the blank area 13 and the short beam 12 extend toward the same side. The blank area 13 may refer to the ear area of ​​the extruded coated gasket, which can also be called a block; the blank area 13 divides the slurry flow channel into multiple grooves, and each of the grooves is equipped with the stirring mechanism. Where the blank area 13 is provided, the corresponding position on the collector may not have a coating. The gasket frame can be provided with a corresponding number of blank areas 13 according to actual needs. Preferably, the coated gasket is provided with a symmetrical structure, and one or two or more stirring mechanisms can be provided in each groove to keep the flow rate of the slurry in each groove as consistent as possible.

[0034] The embodiment of the present application also provides a coating device, which includes the coating gasket as described above, and the coating device may also include: a die head, the die head having a slurry cavity, the gasket frame being installed in the slurry cavity, it should be understood that the die head may include an upper die and a lower die, the upper die and the lower die together enclose a slurry cavity, the slurry cavity is also the cavity in the die head mentioned in the above embodiment, the slurry cavity is connected to the slurry flow channel; the die head has a slurry inlet and a slurry outlet, the slurry inlet and the slurry outlet are both connected to the slurry cavity, and the gasket frame The slurry outlet of the body is arranged opposite to the slurry outlet of the die head. The slurry inlet is also the inlet mentioned in the above embodiment, and the slurry outlet is also the outlet mentioned in the above embodiment. The slurry enters the slurry flow channel from the slurry inlet and then flows from the slurry outlet to the slurry outlet. Since the stirring mechanism is used for stirring in the slurry flow channel, the slurry pressure at each position entering the slurry outlet can be roughly balanced, which is conducive to improving the consistency of the slurry flow, improving the surface density consistency of the coated electrode, and thus improving the consistency and stability of the lithium-ion battery.

[0035] In some optional embodiments, the gasket frame is connected with a spoiler strip 3, the spoiler strip 3 is hinged to a first turbine 22, and the spoiler strip 3 is connected to a driving mechanism 23, the driving mechanism 23 is connected to a second turbine 24, the second turbine 24 is located on the side of the spoiler strip 3 close to the slurry outlet, and the first turbine 22 is located on the side of the spoiler strip 3 close to the slurry inlet, that is, the first turbine 22 can be arranged close to the slurry inlet, and the slurry at the slurry inlet enters the slurry flow channel when the pressure is strong. After the slurry with strong pressure flows to the first turbine 22, the first turbine 22 can be driven to rotate around the connecting member 21, thereby stirring the slurry around the first turbine 22 to make the slurry pressure on its circumference as consistent as possible. In some other embodiments, the first turbine 22 can also be arranged on a side close to the slurry outlet. It should be understood that although in the embodiment of the present application, the first turbine 22 and the second turbine 24 are arranged on opposite sides of the spoiler strip 3, in some other embodiments, the first turbine 22 and the second turbine 24 can be arranged on the same side of the spoiler strip 3.

[0036] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0038] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A coated gasket, characterized in that: It includes: A gasket frame, wherein the gasket frame has a slurry flow channel, and one side of the gasket frame has a slurry outlet communicated with the slurry flow channel; a stirring mechanism, the stirring mechanism being mounted on the gasket frame and accommodated in the slurry flow channel; The slurry flow channel is provided with a spoiler strip (3), and the stirring mechanism is fixed to the spoiler strip (3).

2. The coated gasket according to claim 1, wherein The stirring mechanism comprises: A connecting member (21), the connecting member (21) being mounted on the spoiler strip (3); A first turbine (22), the first turbine (22) is hinged to the connecting member (21), and the first turbine (22) is located on one side of the spoiler strip (3).

3. The coated gasket according to claim 2, wherein: The stirring mechanism further comprises a driving mechanism (23), wherein the driving mechanism (23) is mounted on the spoiler strip (3), and the driving mechanism (23) is detachably connected to a second turbine (24), and the second turbine (24) is located on a side of the spoiler strip (3) close to the slurry outlet.

4. The coated gasket according to claim 3, wherein: The driving mechanism (23) is closer to the slurry outlet than the second turbine (24), and a flow sensing device (25) is installed on the side of the driving mechanism (23) away from the second turbine (24), and the flow sensing device (25) is signal-connected to the driving mechanism (23).

5. The coated gasket according to claim 1, wherein: There are multiple stirring mechanisms, and the multiple stirring mechanisms are arranged at intervals along the length direction of the spoiler strip (3).

6. The coated gasket according to claim 1, wherein: The gasket frame comprises a crossbeam (11), short beams (12) are respectively fixed at both ends of the crossbeam (11), the crossbeam (11) and the short beams (12) at both ends together enclose the slurry flow channel, and the two ends of the spoiler strip (3) are respectively fixed to the short beams (12) at both ends of the crossbeam (11).

7. The coated gasket according to claim 6, wherein: The gasket frame further comprises a blank area (13), the blank area (13) being fixed to the crossbeam (11), the blank area (13) being arranged between the short beams (12) at both ends, and the blank area (13) and the short beams (12) extending towards the same side; The blank area (13) divides the slurry flow channel into a plurality of grooves, and the stirring mechanism is installed in each groove.

8. A coating device, characterized in that: It comprises the coating gasket according to any one of claims 1 to 7, and the coating device further comprises: A die head having a slurry cavity, wherein the gasket frame is installed in the slurry cavity; The die head has a slurry inlet and a slurry outlet, both of which are communicated with the slurry cavity, and the slurry outlet of the gasket frame is arranged opposite to the slurry outlet of the die head.

9. The coating device according to claim 8, wherein: The gasket frame is connected to a spoiler strip (3), the spoiler strip (3) is hinged to a first turbine (22), and the spoiler strip (3) is connected to a driving mechanism (23), the driving mechanism (23) is connected to a second turbine (24), the second turbine (24) is arranged on a side of the spoiler strip (3) close to the pulp outlet, and the first turbine (22) is arranged on a side of the spoiler strip (3) close to the pulp inlet.

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