Double-layer coating die head and coating machine

Abstract

The utility model relates to the technical field of coating machines and coating machine accessories, in particular to a double-layer coating die head and a coating machine, and the double-layer coating die head comprises an upper die head, a middle die head and a lower die head which are sequentially arranged from top to bottom; a first gasket is clamped between the upper die head and the middle die head, and a first coating slit and a first coating lip communicated with the first coating slit are defined by the first gasket, the upper die head and the middle die head; a second gasket is clamped between the middle die head and the lower die head, and a second coating slit and a second coating lip communicated with the second coating slit are defined by the second gasket, the middle die head and the lower die head; wherein the first coating slit is inclined downwards, and the second coating slit is inclined upwards. The double-layer coating die head solves the technical problems that an existing double-layer coating die head is small in application range, the trailing phenomenon exists during intermittent coating, and consequently a battery pole piece is unqualified.

Description

Technical Field

[0001] The utility model relates to the technical field of coating machines and coating machine accessories, in particular to a double-layer coating die head and a coating machine. Background Art

[0002] Slot extrusion coating technology is an advanced pre-metered coating technology. During coating, all the fluid fed into the coating die forms a coating on the substrate. Therefore, the surface density of the wet coating can be accurately controlled by changing the slurry feeding speed and coating speed. A certain flow of slurry enters the internal cavity of the coating die from the extruder feed port and forms a stable pressure. The slurry is finally extruded from the die slit outlet and coated on the foil. The coating is dried in an oven.

[0003] Reference Figure 1 The existing double-layer coating die head usually includes an upper die head, a middle die head and a lower die head which are arranged in sequence from top to bottom. The upper die head and the middle die head are sandwiched with a first gasket to enclose a first coating slit and a first coating lip connected to the first coating slit. The middle die head and the lower die head are sandwiched with a second gasket to enclose a first coating slit and a second coating lip connected to the second coating slit. The first coating slit is arranged horizontally, and the second coating slit is arranged downwardly inclined. In this structure, the second coating slit is inclined downwardly at a large angle. In order to ensure the structural strength of the lower die head and the arrangement of other components, the busbar height of the lower die head needs to be increased, resulting in a large busbar height of the lower die head, which is difficult to be adapted and installed in the coating machine; or, referring to Figure 2 The second coating slit is set horizontally, and the first coating slit is set upwardly inclined. The angle of the first coating slit of this structure is too large. When applied to intermittent coating, the slurry will flow out due to the influence of gravity during the start and stop of intermittent coating, and the tailing is serious during intermittent coating, resulting in unqualified battery electrodes. Utility Model Content

[0004] The utility model provides a double-layer coating die head and a coating machine, which solve the technical problems that the existing double-layer coating die head has a small application range and there is a tailing phenomenon during intermittent coating, resulting in unqualified battery pole pieces.

[0005] In view of this, the first aspect of the utility model provides a double-layer coating die, comprising an upper die, a middle die and a lower die arranged in sequence from top to bottom; a first gasket is sandwiched between the upper die and the middle die, and the first gasket, the upper die and the middle die together form a first coating slit and a first coating lip connected to the first coating slit; a second gasket is sandwiched between the middle die and the lower die, and the second gasket, the middle die and the lower die together form a second coating slit and a second coating lip connected to the second coating slit; wherein the first coating slit is arranged to be inclined downward, and the second coating slit is arranged to be inclined upward.

[0006] Optionally, the first coating slit and the second coating slit are arranged horizontally symmetrically.

[0007] Optionally, the angle between the first coating slit and the horizontal plane is 8 degrees to 15 degrees.

[0008] Optionally, the angle between the first coating slit and the horizontal plane is 10 degrees, and the generatrix height of the lower die head is 70 mm.

[0009] Optionally, the upper die head is provided with a T-block adjustment mechanism for adjusting the coating thickness of the first coating lip.

[0010] Optionally, the T-block adjustment mechanism includes multiple groups of adjustment components, which are arranged along the length direction of the first coating lip; each group of the adjustment components includes a T-block and a driving member, and the upper die head is penetrated by a through hole for accommodating the T-block; one end of the T-block extends into the first coating slit, and the other end extends out of the upper die head along the through hole; the driving member is arranged on the upper die head, and the output end of the driving member is drivingly connected to the end of the T-block extending out of the upper die head, suitable for driving the T-block to move along the axial direction of the through hole to adjust the coating thickness.

[0011] Optionally, the driving member is a linear motor or a servo motor.

[0012] Optionally, the driving member is a differential head.

[0013] Optionally, the lower die head is provided with a push-pull rod adjustment mechanism for adjusting the coating thickness of the first coating lip.

[0014] A second aspect of this embodiment provides a coating machine, comprising a double-layer coating die head as described in any one of the first aspects.

[0015] The technical solution of the utility model has the following advantages:

[0016] In the utility model, by changing the placement angle of the middle die head, during coating, the middle die head is placed horizontally with the angle bisector as the standard, so that the middle die head is offset up and down relative to the horizontal position, that is, the first coating slit formed by the middle die head and the upper die head is arranged to be tilted upward. Under this arrangement, intermittent coating is convenient. Since the middle die head is offset downward at a certain angle, the angle of the first coating slit is smaller, so that the slurry is prevented from flowing out due to the influence of gravity during the intermittent coating process due to the excessive angle of the first coating slit, and the tailing phenomenon during intermittent coating is eliminated, thereby improving the uniformity of coating. And the quality of the battery pole piece formed, at the same time, the second coating slit formed by the middle die head and the lower die head is tilted downward, which is convenient for continuous coating under this arrangement. Since the middle die head is biased upward at a certain angle, the space occupied by the bottom of the middle die head to the lower die head is reduced, so that the lower die head can reduce the busbar height while ensuring the structural strength and other components. It is convenient to adapt and install it on the coating machine, improve the scope of application, avoid improving the coating machine, save costs, and take into account both continuous coating and intermittent coating. The double-layer coating die head provided in this embodiment improves the rationality of the arrangement by adjusting the angle and layout position of the middle die head, and improves the overall scope of application and coating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The first prior art figure is the background art;

[0019] Figure 2 A second prior art figure is provided as background art;

[0020] Figure 3 A schematic diagram of the structure of the double-layer coating die head provided by the utility model at a first viewing angle;

[0021] Figure 4 This is a schematic structural diagram of the double-layer coating die head provided by the utility model at a second viewing angle.

[0022] Description of reference numerals:

[0023] 1. Upper die head; 2. Middle die head; 3. Lower die head; 4. First coating slit; 5. First coating lip; 6. Second coating slit; 7. Second coating lip; 8. T-block adjustment mechanism; 9. Push-pull rod adjustment mechanism; 10. First feed port; 11. Second feed port. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Example 1

[0029] See also Figure 3 and Figure 4, the present embodiment provides a double-layer coating die, comprising an upper die 1, a middle die 2 and a lower die 3 arranged in sequence from top to bottom; a first gasket is sandwiched between the upper die 1 and the middle die 2, the first gasket, the upper die 1 and the middle die 2 are enclosed to form a first coating slit 4 and a first coating lip 5 connected to the first coating slit 4; a second gasket is sandwiched between the middle die 2 and the lower die 3, the second gasket, the middle die 2 and the lower die 3 are enclosed to form a second coating slit 6 and a second coating lip 7 connected to the second coating slit 6; wherein, the first coating slit 4 is arranged to be tilted downward, that is, the first coating slit 4 gradually tilts downward from the inner side to one side of the first coating lip 5, and the angle between the first coating slit 4 and the horizontal plane is 10 degrees, and the second coating slit 6 is arranged to be tilted upward, that is, the second coating slit 6 gradually tilts upward from the inner side to one side of the second coating lip 7.

[0030] It should be noted that, when the double-layer coating die is horizontally arranged, the generatrix height of the lower die 3 is the vertical distance from the topmost end surface to the bottommost end surface of the lower die 3 .

[0031] In this embodiment, by changing the placement angle of the middle die head 2, during coating, the middle die head 2 is placed horizontally with the angle bisector as the reference, so that the middle die head 2 is offset up and down relative to the horizontal position, that is, the first coating slit 4 formed by the middle die head 2 and the upper die head 1 is arranged to be tilted downward. In this arrangement, intermittent coating is convenient. Since the middle die head 2 is offset downward at a certain angle, the angle of the first coating slit 4 is small, which avoids the slurry flowing out under the influence of gravity during the intermittent coating process due to the excessive angle of the first coating slit 4, eliminates the tailing phenomenon during intermittent coating, and improves the uniformity of coating. The second coating slit 6 formed by the middle die head 2 and the lower die head 3 is tilted upward. This arrangement is convenient for continuous coating. Since the middle die head 2 is biased upward at a certain angle, the space occupied by the bottom of the middle die head 2 on the lower die head 3 is reduced, so that the lower die head 3 can reduce the busbar height while ensuring the structural strength and other components. It is convenient to be installed on the coating machine with adaptation, improve the scope of application, avoid improving the coating machine, save costs, and take into account both continuous coating and intermittent coating. The double-layer coating die head provided in this embodiment improves the rationality of the arrangement by adjusting the angle and arrangement position of the middle die head 2, and improves the overall scope of application and coating effect.

[0032] Example 2

[0033] As a further improvement to Example 1, Figure 3 As shown, the first coating slit 4 and the second coating slit 6 are horizontally symmetrically arranged, that is, the first coating slit 4 and the second coating slit 6 are symmetrically arranged with the horizontal line as the axis.

[0034] In this embodiment, the first coating slit 4 and the second coating slit 6 are symmetrically arranged to improve coating uniformity and coating effect.

[0035] Based on the above embodiment, in a preferred embodiment, the angle between the first coating slit 4 and the horizontal plane is 8 degrees to 15 degrees, that is, the angle between the second coating slit 6 and the horizontal plane is also 8 degrees to 15 degrees.

[0036] In this embodiment, the angle between the first coating slit 4 and the second coating slit 6 and the horizontal plane is set to 8 degrees to 15 degrees for limitation, so as to avoid the slurry in the first coating slit 4 flowing out due to gravity due to the angle being too large, and the middle die head occupying a larger space of the lower die head, resulting in an increase in the generatrix of the lower die head, while avoiding the angle being too small, which affects the coating effect and the structural strength of the middle die head and the connection of other components; this embodiment does not limit the angle between the first coating slit 4 and the horizontal plane, and the angle between the first coating slit 4 and the horizontal plane can be selected to be 8 degrees, 10 degrees or 15 degrees, and the specific technical personnel in this field can make a selection according to the actual situation.

[0037] Based on the above implementation, in a preferred implementation, Figure 4 As shown, the angle between the first coating slit 4 and the horizontal plane is 10 degrees, and the generatrix height of the lower die head 3 is 70 mm.

[0038] In this embodiment, by setting the busbar height of the lower die head 3 to preferably 70 mm, the angle between the first coating slit 4 and the horizontal plane is 10 degrees, that is, the vertical section of the middle die head 2 is set in a cone with an angle of 20 degrees, thereby ensuring the structural strength of the lower die head and being adaptable to the existing coating machine with a busbar height of 70 mm, thereby improving the scope of application, avoiding the need to adapt and change the bottom plate of the coating machine, and saving costs; this embodiment does not make specific restrictions on the busbar height of the lower die head 3, and the busbar height of the lower die head 3 can also be selected according to the busbar height of the matching coating machine. Compared with the existing double-layer coating die head, the lower die head 3 of the double-layer coating die head provided in this embodiment is compatible with a wider range of coating machines.

[0039] Based on the above implementation, in a preferred implementation, Figure 3 and Figure 4 As shown, the upper die head 1 is provided with a T-block adjustment mechanism 8 for adjusting the coating thickness of the first coating lip 5 .

[0040] In this embodiment, the coating thickness of the first coating lip 5 can be adjusted by the T-block adjustment mechanism 8 according to different coating requirements, thereby improving the scope of application.

[0041] On the basis of the above-mentioned embodiment, in a preferred embodiment, the T-block adjustment mechanism 8 includes a plurality of adjustment components, and the plurality of adjustment components are arranged along the length direction of the first coating lip 5; each group of adjustment components includes a T-block and a driving member, and the upper die head 1 is penetrated by a through hole for accommodating the T-block; one end of the T-block extends into the first coating slit 4, and the other end extends out of the upper die head 1 along the through hole; the driving member is arranged on the upper die head 1, and the output end of the driving member is drivingly connected to the end of the T-block extending out of the upper die head 1, and is suitable for driving the T-block to move along the axial direction of the through hole to adjust the coating thickness.

[0042] It should be noted that the plurality of T-blocks are arranged side by side along the length direction of the first coating lip 5 and correspond to the positions of the coating lip.

[0043] In this embodiment, when it is necessary to adjust the coating thickness of the first coating lip 5, the T-block at the corresponding position is driven by the driving member to move along the axial direction of the through hole in the first coating slit 4. When the T-block is driven away from the middle die head 2, the slurry flow rate and surface density at the corresponding position in the first coating slit 4 increase, and the coating thickness at the corresponding position of the first coating lip 5 increases. Conversely, when the T-block is driven close to the middle die head 2, the slurry flow rate and surface density at the corresponding position in the first coating slit 4 decrease, and the coating thickness at the corresponding position of the first coating lip 5 decreases, thereby improving the adjustment accuracy.

[0044] Based on the above embodiments, in a preferred embodiment, the driving element is a linear motor or a servo motor.

[0045] In this embodiment, the driving element can be electrically driven by a linear motor or a servo motor, which saves time and effort and improves the degree of intelligence.

[0046] Based on the above implementation, in a preferred implementation, the driving member is a differential head.

[0047] In this embodiment, the driving member can also be manually adjusted using a differential head to improve the adjustment accuracy.

[0048] Based on the above implementation, in a preferred implementation, Figure 4 As shown, the lower die head 3 is provided with a push-pull rod adjustment mechanism 9 for adjusting the coating thickness of the first coating lip 5 .

[0049] In this embodiment, the coating thickness of the second coating lip 7 can be adjusted by the push-pull rod adjustment mechanism 9 according to different coating requirements, thereby improving the scope of application.

[0050] Specifically, the push-pull rod adjustment mechanism 9 includes an adjusting screw that cooperates with the lower die head 3. The lower die head 3 is provided with a through groove that penetrates through the bottom of the lower die head 3 along the coating width direction. The adjusting screw can be inserted into the through groove and adjust the width of the through groove, thereby applying a force to the lip of the lower die head 3 to correspondingly expand or reduce the gap between the lip of the lower die head 3 and the middle die head 2, so as to achieve the adjustment of the coating thickness of the first coating lip 5, improve the convenience of adjustment and facilitate precise control.

[0051] Specifically, Figure 4 As shown, the upper die head 1 is provided with a first feed port 10 connected with the first coating gap, so as to facilitate the introduction of slurry for coating.

[0052] Specifically, Figure 4 As shown, the lower die head 3 is provided with a second feed port 11 connected with the second coating gap, so as to facilitate the introduction of slurry for coating.

[0053] The specific working principle of the double-layer coating die provided in this embodiment is as follows: by changing the angle of the middle die 2, the angle of the middle die 2 is set to 20 degrees, so that during coating, the middle die 2 is placed horizontally with the angle bisector as the standard, so that the middle die 2 is offset 10 degrees up and down relative to the horizontal position, that is, the angle of the first coating slit 4 formed by the middle die 2 and the upper die 1 is 10 degrees with the horizontal plane. The angle is small, which avoids the angle of the first coating slit 4 being too large, resulting in the slurry flowing out due to gravity during the gap coating process, eliminates the tailing phenomenon during intermittent coating, improves the uniformity of coating and the quality of the formed battery pole piece, and the middle die The angle between the second coating slit 6 formed by the middle die 2 and the lower die 3 and the horizontal plane is also 10 degrees, which reduces the space occupied by the bottom of the middle die 2 on the lower die 3, so that the lower die 3 can reduce the busbar height while ensuring the structural strength and other components, so as to facilitate the installation on the coating machine, improve the scope of application, avoid the improvement of the coating machine, save costs, and take into account both continuous coating and intermittent coating. In addition, the thickness of the first coating lip 5 and the second coating lip 7 can be adjusted respectively by the T-block adjustment mechanism 8 and the push-pull rod adjustment mechanism 9 to improve the scope of application. The double-layer coating die provided in this embodiment improves the rationality of the layout by adjusting the angle and layout position of the middle die 2, and improves the overall scope of application and coating effect. It solves the technical problems that the existing double-layer coating die has a small scope of application, tailing phenomenon exists during intermittent coating, and battery pole pieces are unqualified.

[0054] Example 3

[0055] This embodiment provides a coating machine, including the double-layer coating die of embodiment 1 or embodiment 2. The specific structure of the double-layer coating die is the same as that of embodiment 1 or embodiment 2, so that the coating machine having the double-layer coating die has at least the same technical effect as the above-mentioned double-layer coating die. The specific principle is the same as that of embodiment 1 or embodiment 2, and will not be repeated here.

[0056] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A double-layer coating die head, characterized in that: The invention comprises an upper die head (1), a middle die head (2) and a lower die head (3) which are arranged in sequence from top to bottom; a first gasket is sandwiched between the upper die head (1) and the middle die head (2); the first gasket, the upper die head (1) and the middle die head (2) together form a first coating slit (4) and a first coating lip (5) which is connected to the first coating slit (4); a second gasket is sandwiched between the middle die head (2) and the lower die head (3); the second gasket, the middle die head (2) and the lower die head (3) together form a second coating slit (6) and a second coating lip (7) which is connected to the second coating slit (6); wherein the first coating slit (4) is arranged to be inclined downward, and the second coating slit (6) is arranged to be inclined upward.

2. The double-layer coating die head according to claim 1, characterized in that: The first coating slit (4) and the second coating slit (6) are arranged horizontally symmetrically.

3. The double-layer coating die head according to claim 2, characterized in that: The angle between the first coating slit (4) and the horizontal plane is 8 degrees to 15 degrees.

4. The double-layer coating die head according to claim 3, characterized in that: The angle between the first coating slit (4) and the horizontal plane is 10 degrees, and the generatrix height of the lower die head (3) is 70 mm.

5. The double-layer coating die head according to claim 1, characterized in that: The upper die head (1) is provided with a T-block adjustment mechanism (8) for adjusting the coating thickness of the first coating lip (5).

6. The double-layer coating die head according to claim 5, characterized in that: The T-block adjustment mechanism (8) comprises a plurality of adjustment components, which are arranged along the length direction of the first coating lip (5); each group of the adjustment components comprises a T-block and a driving member, and the upper die head (1) is provided with a through hole for accommodating the T-block; one end of the T-block extends into the first coating slit (4), and the other end extends out of the upper die head (1) along the through hole; the driving member is arranged on the upper die head (1), and the output end of the driving member is drivingly connected to the end of the T-block extending out of the upper die head (1), and is suitable for driving the T-block to move along the axial direction of the through hole to adjust the coating thickness.

7. The double-layer coating die head according to claim 6, characterized in that: The driving member is a linear motor or a servo motor.

8. The double-layer coating die head according to claim 6, characterized in that: The driving component is a differential head.

9. The double-layer coating die according to any one of claims 1 to 8, characterized in that: The lower die head (3) is provided with a push-pull rod adjustment mechanism (9) for adjusting the coating thickness of the first coating lip (5).

10. A coating machine, characterized in that: It comprises a double-layer coating die as described in any one of claims 1 to 9.

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