Coating gasket, coating die head and coating machine

Abstract

The utility model discloses a coating gasket and discloses a coating die head and coater, wherein the coating gasket comprises a long edge, a first side edge, a second side edge and a plurality of flow guide parts, the first side edge is arranged at one end of the long edge, the second side edge is arranged at the other end of the long edge, the long edge, the first side edge and the second side edge enclose to form a containing cavity, and the flow guide parts are arranged in the containing cavity. A coating opening is formed between the first side edge and the second side edge, the flow guide parts are arranged on the side, close to the coating opening, of the long edge, the flow guide parts extend in the direction from the long edge to the coating opening, the flow guide parts are arranged at intervals in the length direction of the long edge, and the width of the flow guide parts is gradually reduced in the direction from the long edge to the coating opening. Part of the slurry in the accommodating cavity flows to the coating opening through the flow guide part, and the flow guide part can guide the slurry to flow, so that the thickness of the slurry in the coating opening is uniform, and uniform coating of the slurry is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery coating technology, and in particular to a coating pad, a coating die head and a coating machine. Background Technology

[0002] A coating die head includes an upper die, a lower die, and a coating gasket located between the upper and lower dies. The lower die has a cavity for receiving and distributing the slurry. The coating gasket is used to adjust the extrusion gap. The uniformity of the slurry extruded by the coating die head is usually adjusted by the thickness of the coating gasket. Generally speaking, the thinner the coating gasket, the better the uniformity of the slurry extrusion. However, if the coating gasket is too thin, the pressure inside the cavity will be too high, resulting in discontinuous slurry extrusion and uneven slurry coating. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a coating pad that can ensure uniform coating of slurry.

[0004] This utility model also proposes a coating die head having the above-mentioned coating pad.

[0005] This utility model also proposes a coating machine having the above-mentioned coating die head.

[0006] The coated pad according to a first aspect embodiment of the present invention includes:

[0007] Long side;

[0008] A first side and a second side are arranged opposite to each other along the length direction of the long side. The first side is located at one end of the long side, and the second side is located at the other end of the long side. The long side, the first side, and the second side enclose a receiving cavity. A coating opening is formed between the first side and the second side.

[0009] Multiple flow guides are provided on the side of the long side near the coating opening. The flow guides extend along the direction from the long side to the coating opening. The multiple flow guides are spaced apart along the length of the long side. The width of the flow guides gradually decreases from the long side to the coating opening.

[0010] The coated gasket according to the first aspect of the present invention has at least the following beneficial effects:

[0011] When the coating die extrudes the slurry, the slurry in the receiving cavity flows from the long side to the coating opening. Since the width of the guide section gradually decreases from the long side to the coating opening, the slurry between adjacent guide sections can flow along the length of the long side, so that each position of the coating opening is filled with slurry. This avoids discontinuous slurry extruded by the coating die and makes the thickness of the slurry in the coating opening uniform, ensuring uniform slurry coating.

[0012] According to some embodiments of the present invention, the minimum distance between adjacent guide portions gradually increases from the first side to the second side.

[0013] According to some embodiments of the present invention, the flow guide portion has a first flow guide surface on the side facing the first side, and a second flow guide surface on the side facing away from the first side. Along the direction from the long side to the coating opening, the distance between the first flow guide surface and the first side gradually increases, and the distance between the second flow guide surface and the first side gradually decreases.

[0014] According to some embodiments of the present invention, the first guide surface is an arc structure, the second guide surface is an arc structure, the radius of the first guide surface is greater than the radius of the second guide surface, and the arc length of the first guide surface is less than the arc length of the second guide surface.

[0015] According to some embodiments of the present invention, the end of the guide portion near the coating opening is a sharp-angle structure, and the sharp-angle structure is formed between the first guide surface and the second guide surface.

[0016] According to some embodiments of the present invention, the end of the first guide surface away from the coating opening is connected to the long side, and the end of the second guide surface away from the coating opening is connected to the long side.

[0017] According to some embodiments of the present invention, one end of the guide portion near the coating opening extends into the coating opening.

[0018] According to some embodiments of the present invention, the long side, the first side, the second side, and the guide portion are an integral structure.

[0019] According to a second aspect of the present invention, a coating die head includes an upper die, a lower die, and a coating pad as described in the above embodiments. The coating pad is disposed between the upper die and the lower die. The lower die has a cavity, and the receiving cavity communicates with the cavity. The cavity has a feed inlet.

[0020] The coating die head according to the second aspect embodiment of the present invention has at least the following beneficial effects:

[0021] When the coating die extrudes the slurry, the slurry in the receiving cavity flows from the long side to the coating opening. Since the width of the guide section gradually decreases from the long side to the coating opening, the slurry between adjacent guide sections can flow along the length of the long side, so that each position of the coating opening is filled with slurry. This avoids discontinuous slurry extruded by the coating die and makes the thickness of the slurry in the coating opening uniform, ensuring uniform slurry coating.

[0022] The coating machine according to a third aspect of the present invention includes the coating die head described in the above embodiments.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of the structure of the coated pad according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0027] Figure 3 This is an exploded view of the coating die head according to an embodiment of the present invention.

[0028] Figure label:

[0029] The container cavity 101, coating opening 102, long side 100, first side 200, second side 300, guide section 400, first guide surface 410, second guide surface 420, sharp corner structure 430, upper mold 500, lower mold 600, and cavity 610. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] In related technologies, a coating die head includes an upper die, a lower die, and a coating gasket disposed between the upper and lower dies. The lower die has a cavity for receiving and distributing the slurry. The coating gasket is used to adjust the extrusion gap. The uniformity of the slurry extruded by the coating die head is usually adjusted by the thickness of the coating gasket. Generally speaking, the thinner the coating gasket, the better the uniformity of slurry extrusion. However, if the coating gasket is too thin, the pressure inside the cavity will be too high, resulting in discontinuous slurry extrusion and uneven slurry coating.

[0035] Reference Figure 1 , Figure 2 According to a first aspect embodiment of the present invention, a coating pad includes a long side 100, a first side 200, a second side 300, and a plurality of guide portions 400. The first side 200 is located at one end of the long side 100, and the second side 300 is located at the other end of the long side 100. The long side 100, the first side 200, and the second side 300 enclose a receiving cavity 101. A coating opening 102 is formed between the first side 200 and the second side 300. The plurality of guide portions 400 are located near the long side 100. On one side of the coating opening 102, a guide portion 400 extends along the direction from the long side 100 to the coating opening 102. Multiple guide portions 400 are spaced apart along the length of the long side 100. From the long side 100 to the coating opening 102, the width of the guide portion 400 gradually decreases. In this way, part of the slurry in the receiving cavity 101 flows to the coating opening 102 through the guide portion 400. The guide portion 400 can guide the flow of the slurry so that the thickness of the slurry in the coating opening 102 is uniform, ensuring uniform slurry coating.

[0036] For example, when the coating die extrudes the slurry, the slurry in the receiving cavity 101 flows from the long side 100 to the coating opening 102. Since the width of the guide portion 400 gradually decreases from the long side 100 to the coating opening 102, the slurry between adjacent guide portions 400 can flow along the length of the long side 100, so that each position of the coating opening 102 is filled with slurry. This can prevent the slurry extruded by the coating die from being discontinuous and make the thickness of the slurry in the coating opening 102 uniform, thus ensuring uniform slurry coating.

[0037] In some embodiments of this utility model, the minimum distance between adjacent guide portions 400 gradually increases from the first side 200 to the second side 300. That is, the guide portions 400 near the first side 200 are more dense, while the guide portions 400 near the second side 300 are more sparse. This can reduce the thickness of areas where the coating thickness of the electrode sheet is too thick, so that the thickness of the slurry on the electrode sheet is uniform.

[0038] For example, the lower die 600 of the coating die head is provided with a cavity 610. The cavity 610 is provided with a feed port on the side near the first side 200. The slurry enters the cavity 610 through the feed port. When the slurry fills the cavity 610, the slurry flows in the direction from the first side 200 to the second side 300. After the slurry fills the cavity 610, the slurry flows into the receiving cavity 101. Since the first side 200 is close to the feed port, the amount of slurry discharged from the coating opening 102 near the first side 200 is greater than the amount of slurry discharged from the coating opening 102 near the second side 300. This results in uneven slurry coating thickness on the electrode after the slurry coating thickness in the area of ​​the coating opening 102 near the first side 200 has been exceeded. Since the minimum distance between adjacent guide portions 400 gradually increases from the first side 200 to the second side 300, the number of guide portions 400 on the long side 100 near the first side 200 is greater than the number of guide portions 400 on the long side 100 near the second side 300. This increases the flow resistance of the slurry near the first side 200, thereby reducing the amount of slurry exiting the coating opening 102 near the first side 200. This makes the amount of slurry exiting the coating opening 102 near the first side 200 similar to the amount of slurry exiting the coating opening 102 near the second side 300, thus ensuring uniform slurry thickness coating of the electrode sheet.

[0039] It should be noted that when the feed inlet is located in the middle of the receiving cavity 610, the spacing between the guide parts 400 located in the middle of the long side 100 is smaller than the spacing between the guide parts 400 located at both ends of the long side 100, which will not be described in detail here.

[0040] In some embodiments of this utility model, along the direction from the long side 100 to the coating opening 102, the guide portion 400 is provided with a first guide surface 410 on the side facing the first side 200, and a second guide surface 420 on the side of the guide portion 400 away from the first side 200. The distance between the first guide surface 410 and the first side 200 gradually increases, and the distance between the second guide surface 420 and the first side 200 gradually decreases, which can guide the slurry and thus ensure uniform slurry coating.

[0041] It should be noted that the flow velocity of the slurry near the first side 200 is greater than that near the second side 300. By setting the first guide surface 410 and the second guide surface 420, the first guide surface 410 can suppress the flow velocity of the slurry, and the second guide surface 420 can accelerate the flow velocity of the slurry, so that the flow velocities of the slurry on both sides of the guide part 400 are similar, thereby ensuring uniform slurry coating.

[0042] For example Figure 2 As shown, in some embodiments of this utility model, the first guide surface 410 is an arc structure, the second guide surface 420 is an arc structure, the radius of the first guide surface 410 is R1, the radius of the second guide surface 420 is R2, the arc length of the first guide surface 410 is L1, and the arc length of the second guide surface 420 is L2, satisfying: R1>R2, L1<L2, so that the flow velocity of the slurry on both sides of the guide part 400 is similar, thereby ensuring uniform slurry coating.

[0043] Specifically, since the radius R1 of the first guide surface 410 is greater than the radius R2 of the second guide surface 420, and the arc length L1 of the first guide surface 410 is less than the arc length L2 of the second guide surface 420, that is, the first guide surface 410 is steeper and the second guide surface 420 is gentler, the first guide surface 410 can suppress the flow rate of the slurry, and the second guide surface 420 can accelerate the flow rate of the slurry, so that the flow rates of the slurry on both sides of the guide section 400 are similar, thereby ensuring uniform slurry coating.

[0044] As another implementation, the first guide surface 410 can also be an inclined structure, and the second guide surface 420 can also be an inclined structure, without limitation.

[0045] In some embodiments of this utility model, the end of the guide portion 400 near the coating opening 102 is a sharp corner structure 430, and the sharp corner structure 430 is formed between the first guide surface 410 and the second guide surface 420, so that the slurry located on both sides of the guide portion 400 can converge at the coating opening 102 to avoid discontinuous slurry extrusion, thereby improving the slurry.

[0046] In some embodiments of this utility model, the end of the first guide surface 410 away from the coating opening 102 is connected to the long side 100, and the end of the second guide surface 420 away from the coating opening 102 is connected to the long side 100, so that the first guide surface 410 and the second guide surface 420 can guide the slurry from the position of the long side 100, and can avoid the slurry from accumulating at the connection position between the guide part 400 and the long side 100.

[0047] For example, along the direction from the long side 100 to the coating opening 102, one end of the first guide surface 410 is connected to one end of the second guide surface 420, and the other end of the second guide surface 420 is connected to the long side 100. This allows the first guide surface 410 and the second guide surface 420 to guide the slurry from the position of the long side 100, thus preventing the slurry from accumulating at the connection position between the guide portion 400 and the long side 100.

[0048] In some embodiments of this utility model, the end of the guide portion 400 near the coating opening 102 extends into the coating opening 102, which helps the guide portion 400 reduce the coating thickness of the slurry.

[0049] In some embodiments of this utility model, the long side 100, the first side 200, the second side 300, and the guide portion 400 are an integral structure, which can reduce the number of molds, thereby reducing the production and manufacturing cost of the molds and thus reducing the production and manufacturing cost of the coating gasket.

[0050] For example, the long side 100, the first side 200, the second side 300, and the guide section 400 can be integrally formed by stamping, which can reduce the number of molds, thereby reducing the production cost of the molds and thus reducing the production cost of the coated gasket.

[0051] As another implementation, the long side 100, the first side 200, the second side 300 and the guide portion 400 can also be connected by welding, wherein the welding method includes, but is not limited to, resistance welding, laser welding or ultrasonic welding.

[0052] Reference Figure 3 According to a second aspect embodiment of the present invention, a coating die head includes an upper die 500, a lower die 600, and a coating pad according to a first aspect embodiment of the present invention. The coating pad is disposed between the upper die 500 and the lower die 600. The lower die 600 is provided with a cavity 610. A receiving cavity 101 communicates with the cavity 610. The cavity 610 has a feed inlet. Part of the slurry in the receiving cavity 101 flows to the coating opening 102 through a guide part 400. The guide part 400 can guide the flow of the slurry so that the thickness of the slurry in the coating opening 102 is uniform, ensuring uniform slurry coating.

[0053] For example, when the coating die extrudes the slurry, the slurry in the receiving cavity 101 flows from the long side 100 to the coating opening 102. Since the width of the guide portion 400 gradually decreases from the long side 100 to the coating opening 102, the slurry between adjacent guide portions 400 can flow along the length of the long side 100, so that each position of the coating opening 102 is filled with slurry. This can prevent the slurry extruded by the coating die from being discontinuous and make the thickness of the slurry in the coating opening 102 uniform, thus ensuring uniform slurry coating.

[0054] In this embodiment, the feed inlet is located on the side of the cavity 610 near the first side 200. From the first side 200 to the second side 300, the minimum distance between adjacent guide portions 400 gradually increases, which can reduce the amount of slurry discharged from the coating opening 102 near the first side 200, so that the amount of slurry discharged from the coating opening 102 near the first side 200 is close to the amount of slurry discharged from the coating opening 102 near the second side 300, thereby ensuring that the slurry thickness of the electrode sheet is uniformly coated.

[0055] Reference Figure 1 , Figure 2 The coating machine according to the third aspect of the present invention includes the coating die head of the second aspect of the present invention, which can ensure that the slurry coating thickness of the electrode sheet is uniform.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A coated gasket, characterized in that, include: Long side (100); A first side (200) and a second side (300) are arranged opposite to each other along the length direction of the long side (100). The first side (200) is located at one end of the long side (100), and the second side (300) is located at the other end of the long side (100). The long side (100), the first side (200), and the second side (300) enclose a cavity (101). A coating opening (102) is formed between the first side (200) and the second side (300). Multiple flow guides (400) are provided on the side of the long side (100) near the coating opening (102). The flow guides (400) extend along the direction from the long side (100) to the coating opening (102). The multiple flow guides (400) are spaced apart along the length direction of the long side (100). The width of the flow guides (400) gradually decreases from the long side (100) to the coating opening (102).

2. The coated gasket according to claim 1, characterized in that, From the first side (200) to the second side (300), the minimum distance between adjacent guide portions (400) gradually increases.

3. The coated gasket according to claim 2, characterized in that, The guide section (400) has a first guide surface (410) on the side facing the first side (200), and a second guide surface (420) on the side away from the first side (200). Along the direction from the long side (100) to the coating opening (102), the distance between the first guide surface (410) and the first side (200) gradually increases, and the distance between the second guide surface (420) and the first side (200) gradually decreases.

4. The coated gasket according to claim 3, characterized in that, The first guide surface (410) is an arc structure, the second guide surface (420) is an arc structure, the radius of the first guide surface (410) is greater than the radius of the second guide surface (420), and the arc length of the first guide surface (410) is less than the arc length of the second guide surface (420).

5. The coated gasket according to claim 3, characterized in that, The end of the guide section (400) near the coating opening (102) is a sharp-angle structure (430), and the sharp-angle structure (430) is formed between the first guide surface (410) and the second guide surface (420).

6. The coated gasket according to claim 3, characterized in that, The end of the first guide surface (410) away from the coating opening (102) is connected to the long side (100), and the end of the second guide surface (420) away from the coating opening (102) is connected to the long side (100).

7. The coated gasket according to claim 1, characterized in that, The guide portion (400) extends into the coating opening (102) at one end near the coating opening (102).

8. The coated gasket according to claim 1, characterized in that, The long side (100), the first side (200), the second side (300), and the guide section (400) are an integral structure.

9. A coating die head, characterized in that, The device includes an upper mold (500), a lower mold (600), and a coating pad as described in any one of claims 1 to 8, the coating pad being disposed between the upper mold (500) and the lower mold (600), the lower mold (600) having a cavity (610), the receiving cavity (101) communicating with the cavity (610), and the cavity (610) having a feed inlet.

10. A coating machine, characterized in that, Includes the coating die head as described in claim 9.

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