Filtering device and coating buffer tank

Abstract

The utility model relates to the technical field of battery production, and discloses a filtering device and a coating buffer tank, the filtering device is used for the coating buffer tank, the filtering device comprises a device main body, the device main body is of a cylindrical structure with an opening in the upper end, a plurality of liquid outlet holes are formed in the outer wall of the device main body, a filter screen is arranged in the device main body, and the liquid outlet holes are communicated with the liquid outlet holes. The filter screen is of an annular structure arranged along the inner peripheral side wall of the device main body; the device main body and the filter screen are made of stainless steel, and the filter precision of the filter screen is 50-300 meshes. According to the filtering device, the filtering device main body and the filtering net are made of stainless steel, and the phenomenon of reaction between the impregnated modified chemical fiber material and slurry is avoided in the filtering process, so that film surface abnormity such as bright spots and bright spots in the coating process caused by chemical reaction of the slurry in the filtering process is avoided, and the subsequent coating effect is ensured. In addition, the stainless steel material can be repeatedly cleaned and used, so that the purpose of reducing the cost is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and particularly relates to a filtering device and a coating buffer tank. Background Art

[0002] During the coating process of lithium-ion battery separator membranes, a buffer tank is required to store the slurry for coating. In the existing slurry filtering method in the buffer tank, a 50-300 mesh filter bag is generally used to filter the slurry. However, since the filter bag is generally made of impregnated modified chemical fiber material, a chemical reaction will occur when this material comes into contact with the separator coating slurry, resulting in abnormal film surfaces such as bright spots and bright patches during the coating process, which affects the subsequent coating effect. Utility Model Content

[0003] To solve the above technical problems, the present application provides a filtering device and a coating buffer tank, which can avoid chemical reactions occurring during the filtration of the separator coating slurry, resulting in abnormal film surfaces such as bright spots and bright patches during the coating process, and ensure the subsequent coating effect.

[0004] The technical solution adopted by the present application to solve its technical problems is as follows:

[0005] A filtering device for a coating buffer tank, the filtering device includes a device main body, the device main body is a cylindrical structure with an open upper end, a plurality of liquid outlet holes are provided on the outer wall of the device main body, a filter net is provided inside the device main body, and the filter net is an annular structure arranged along the inner peripheral side wall of the device main body; the materials of the device main body and the filter net are both stainless steel, the filtering precision of the filter net is 50-300 meshes, and the aperture of the liquid outlet hole is larger than the aperture of the filtering hole of the filter net.

[0006] Preferably, the materials of the device main body and the filter net are SUS304 or SUS316.

[0007] Preferably, the cross-section of the device main body on the horizontal plane is oval, its major axis dimension is A, its minor axis dimension is B, the height of the device main body is H, the value range of A is 18-25 cm, the value range of B is 8-15 cm, and the value range of H is 10-15 cm.

[0008] Preferably, a hook is further provided on the device main body, and the hook is used for hanging so that the device main body can be placed in the coating buffer tank.

[0009] Preferably, the hook is connected to the device main body through a suspension arm, the hook includes a connected suspension part and an anti-detachment part, the suspension part is arc-shaped, the other end of which is connected to the suspension arm, the anti-detachment part is parallel to the suspension arm, and the distance between the anti-detachment part and the suspension arm is C, and C is 2-3 cm.

[0010] Preferably, there are two hooks and two jibs, which correspond to each other one by one. The two jibs are parallel to each other, and the plane determined by the center lines of the two jibs is parallel to the major axis of the ellipse.

[0011] The width of the jib is W, and the distance between the two jibs is L. W = (0.1 - 0.2)A, and L = (0.45 - 0.55)A.

[0012] A coating buffer tank includes the above-mentioned filtering device, a tank body, a delivery pipe and a reflux pipe connected to the tank body. The reflux pipe is arranged above the delivery pipe. The filtering device is arranged inside the tank body and is located between the reflux pipe and the delivery pipe. The liquid outlet of the reflux pipe is communicated with the upper end opening of the filtering device. A stirring assembly for stirring the slurry is also arranged inside the tank body.

[0013] Preferably, the distance between the lower end face of the device main body and the highest slurry liquid level inside the tank body is S, and 0.5 mm ≤ S ≤ 1.5 mm.

[0014] Preferably, the tank body is cylindrical, the cross-section of the device main body located in the horizontal plane is elliptical, one side of the device main body connecting the hook abuts against the inner wall of the tank body, the inner diameter of the tank body is D, and the major axis dimension of the ellipse is A, and A = (0.3 - 0.4)D.

[0015] Preferably, a cover body is provided on the tank body, a motor is provided on the cover body, the stirring assembly includes a stirring shaft and a stirring paddle arranged at the lower end of the stirring shaft, and the upper end of the stirring shaft is connected to the motor.

[0016] Compared with the prior art, a filtering device and a coating buffer tank according to an embodiment of the present application have the beneficial effects that: by using stainless steel to make the filtering device main body and the filter mesh, the phenomenon that the existing filter bag made of impregnated modified chemical fiber material reacts with the slurry will not occur during the filtering process, thereby avoiding the film surface abnormalities such as bright spots and bright patches caused by chemical reactions of the slurry during filtering, and ensuring the subsequent coating effect. At the same time, the filtering accuracy of the filter mesh is set to 50 - 300 meshes, corresponding to the particle size of the slurry, and has a good filtering effect.

[0017] In addition, using stainless steel material can also be repeatedly cleaned and used, achieving the purpose of reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the filtering device of the coating buffer tank of the present application.

[0019] Figure 2This is a side view of the coating buffer tank filtering device of the present application.

[0020] Figure 3 This is a schematic structural diagram of the coating buffer tank of the present application.

[0021] Wherein: 1 - filtering device, 11 - device main body, 12 - liquid outlet hole, 13 - filter net, 14 - hook, 141 - hanging part, 142 - anti - detachment part, 15 - hanging arm, 16 - installation groove, 2 - tank body, 3 - conveying pipe, 4 - return pipe, 5 - highest slurry liquid level, 6 - cover body, 7 - motor, 8 - stirring shaft, 9 - stirring paddle. Specific embodiments

[0022] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0023] In the present application, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0024] As Figure 1-2 shown, a filtering device 1 of a preferred embodiment of the present application is used for a coating buffer tank. The filtering device 1 includes a device main body 11. The device main body 11 is a cylindrical structure with an open upper end. A plurality of liquid outlet holes 12 are provided on the outer wall of the device main body 11. A filter net 13 is provided inside the device main body 11. The filter net 13 is an annular structure arranged along the inner peripheral side wall of the device main body 11. The materials of the device main body 11 and the filter net 13 are both stainless steel. Specifically, the specific materials of the device main body 11 and the filter net 13 can be the same or different types of stainless steel materials, preferably the same material for easy processing, and preferably SUS304 or SUS316.

[0025] That is, the inside of the device main body 11 is an installation groove 16. The filter net 13 is adapted to the shape of the installation groove 16 and fits with the inner side wall of the installation groove 16. Of course, there can also be a gap between the filter net 13 and the inner side wall of the installation groove 16, and the filtering effect is basically the same. However, this method is troublesome to assemble, so it is preferably set to fit.

[0026] The filtration accuracy of the filter screen 13 is 50 to 300 mesh. Such as 60 mesh, 70 mesh, 80 mesh, 90 mesh, 100 mesh, 120 mesh, 150 mesh, 180 mesh, 200 mesh, 220 mesh, 250 mesh, 280 mesh, 300 mesh, or the value or range between any two of them. Using the filter screen with the above accuracy, corresponding to the particle size of the slurry, a better slurry filtration effect can be achieved. Specifically, it can filter aqueous and oily slurries containing 90% of 14 μm particle size or 50% of 4 μm particle size or 10% of 0.5 μm particle size, with a viscosity of 50 to 5000 mPa·s and a solid content of 0 to 50 ± 2%. At the same time, the aperture of the liquid outlet hole 12 is larger than the aperture of the filter holes of the filter screen 13, which also ensures that the filtered slurry can flow out of the device main body 11 quickly. Preferably, the aperture of the liquid outlet hole is 5 mm ± 0.5 mm.

[0027] A hook 14 is further provided on the device main body 11, and the hook 14 is used for hanging so that the device main body 11 can be placed in the coating buffer tank.

[0028] Based on the above technical features, for the coating buffer tank filtering device, by using stainless steel to make the filter device main body 11 and the filter screen 13, the phenomenon of reaction between the impregnated modified chemical fiber material and the slurry will not occur during the filtering process, thus avoiding the film surface abnormalities such as bright spots and bright patches caused by chemical reactions of the slurry during filtering, and ensuring the subsequent coating effect.

[0029] In addition, using stainless steel material can also be repeatedly cleaned and used, so as to achieve the purpose of reducing costs.

[0030] Please refer to the attached Figure 3 , to solve the above technical problems, the present application also provides a coating buffer tank, including the above filtering device 1, a tank body 2, a conveying pipe 3 and a reflux pipe 4 provided on the tank body 2. The filtering device 1 is arranged inside the tank body 2. The reflux pipe 4 is arranged above the conveying pipe 3, and the liquid outlet of the reflux pipe 4 is communicated with the opening of the filtering device 1. Specifically, the filtering device 1 is located between the reflux pipe 4 and the conveying pipe 3, and the liquid outlet of the reflux pipe 4 is directly above the opening.

[0031] After the isolation film coating slurry is conveyed through the reflux pipe 4, it flows into the filtering device 1 for filtering. The filtered slurry passes through the conveying pipe 3 and is introduced into the coating material box under the action of a conveying pump. A stirring assembly for stirring the slurry is also arranged inside the tank body 2, so that the slurry can be stirred in real time during the conveying process to ensure the quality of the slurry.

[0032] A valve is provided on the conveying pipe 3 to control the liquid level height in the tank body 2. However, to ensure the filtering effect, the liquid level height in the tank body 2 needs to be strictly controlled. Specifically, if the distance between the lower end face of the device main body 11 and the highest slurry liquid level 5 inside the tank body 2 is S, then 0.5mm ≤ S ≤ 1.5mm, such as S = 0.6mm, S = 0.7mm, S = 0.8mm, S = 0.9mm, S = 1mm, S = 1.1mm, S = 1.2mm, S = 1.3mm, S = 1.4mm, etc.

[0033] To strictly control the value of S, a liquid level sensor can be provided inside the tank body 2. The valve on the conveying pipe 3 is an electronic valve, and the electronic valve is electrically connected to the liquid level sensor, facilitating real-time control of the highest liquid level in the tank body 2 and ensuring the filtering effect.

[0034] In this embodiment, the tank body 2 is cylindrical, and its inner diameter is larger than the size of the device main body 11. At the same time, during installation, to ensure the stability of the filtering device 1 and avoid the filtering device 1 affecting the stirring of the stirring assembly, the filtering device 1 is fitted to the inner wall of the tank body 2. In view of the above setting requirements and to pursue the maximum filtering effect, the cross-section of the device main body 11 located in the horizontal plane can be set to an ellipse. Specifically:

[0035] The hook 14 is connected to the device main body 11 through a suspension arm 15. The hook 14 includes a connected suspension part 141 and an anti-detachment part 142. The suspension part 141 is arc-shaped, and its other end is connected to the suspension arm 15. The anti-detachment part 142 is parallel to the suspension arm 15, and the distance between the anti-detachment part 142 and the suspension arm 15 is C, where C is 2 - 3 cm, such as 2.1 cm, 2.2 cm, 2.3 cm, 2.4 cm, 2.5 cm, 2.6 cm, 2.7 cm, 2.8 cm, 2.8 cm, which can fit the upper end of the tank body 2, preferably 2.5 cm. The length of the anti-detachment part 142 can be 4 - 6 cm, such as 5 cm. The suspension part 141 abuts against the upper end face of the tank body 2, the anti-detachment part 142 abuts against the outer wall of the tank body 2, the device main body 11 is located inside the tank body 2, and the side of the device main body 11 connected to the hook 14 abuts against the inner wall of the tank body 2, thereby realizing the installation of the filtering device 1.

[0036] At the same time, to ensure the stability of the connection, both the hook 14 and the suspension arm 15 are two and correspond one by one. The two suspension arms 15 are parallel, and the plane determined by the center lines of the two suspension arms 15 is parallel to the major axis of the ellipse.

[0037] As described above, setting the device main body 11 to have an elliptical cross-section can ensure that the filtering device 1 has the maximum filtering effect. Specifically, it is to ensure that the contact area between the device main body 11 and the inner wall of the tank body 2 is minimized, while also ensuring the stability of the connection between the filtering device 1 and the tank body 2. Since the distance between the anti-detachment part 142 and the lifting arm 15 has been determined, it is necessary to strictly ensure the dimensional relationship between the distance between the two lifting arms 15 and the device main body 11 in order to obtain the best filtering effect. Specifically:

[0038] Please refer to the appendix Figure 1 、 2 , if the major axis dimension of the ellipse is A, the minor axis dimension is B, the height of the device main body 11 is H, and the inner diameter of the tank body 2 is D, then A = (0.3 - 0.4)D, such as 0.31D, 0.32D, 0.33D, 0.34D, 0.35D, 0.36D, 0.37D, 0.38D, 0.39D, or any value or range between any two adjacent values above. The width of the lifting arm 15 is W, and the distance between the two lifting arms 15 is L, W = (0.1 - 0.2)A, such as 0.11A, 0.12A, 0.13A, 0.14A, 0.15A, 0.16A, 0.17A, 0.18A, 0.19A, or any value or range between any two adjacent values above. L = (0.45 - 0.55)A, such as 0.46A, 0.47A, 0.48A, 0.49A, 0.5A, 0.51A, 0.52A, 0.53A, 0.54A, or any value or range between any two adjacent values above.

[0039] Meanwhile, the value range of A is 18 - 25 cm, such as 19 cm, 20 cm, 21 cm, 22 cm, 23 cm, 24 cm, preferably 21 cm. The value range of B is 8 - 15 cm, such as 9 cm, 10 cm, 11 cm, 12 cm, 13 cm, 14 cm, preferably 11 cm. The value range of H is 10 - 15 cm, such as 11 cm, 12 cm, 13 cm, 14 cm, etc., preferably 12 cm.

[0040] When the size D of the tank body 2; the sizes A, B of the device main body 11; and the distance L between the lifting arms 15 simultaneously satisfy the above relational expressions, it can ensure that the filtering device has the best filtering effect and does not affect the operation of the buffer tank.

[0041] In a specific embodiment, A = 21 cm, B = 12 cm, L = 11 cm, D = 63 cm, W = 3 cm, C = 2.5 cm.

[0042] Please refer to the appendix Figure 3, in this embodiment, a cover body 6 is provided on the tank body 2, a motor 7 is provided on the cover body 6, the stirring assembly includes a stirring shaft 8 and a stirring paddle 9 arranged at the lower end of the stirring shaft 8, the upper end of the stirring shaft 8 is connected to the motor 7, and the motor 7 drives the stirring shaft 8 to drive the stirring paddle 9 to stir the slurry to ensure the uniformity of the slurry.

[0043] The coating buffer tank of the present application can effectively improve the chemical reaction between the impregnated chemical fiber filter bag and the coating slurry of the separator film, resulting in film surface abnormalities such as bright spots and bright patches during the coating process. It can be repeatedly cleaned and used to achieve the purpose of cost reduction and efficiency improvement.

[0044] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present application.

Claims

1. A filtering device for a coating buffer tank, characterized in that: The filtering device includes a device main body which is a cylindrical structure with an open upper end. A plurality of liquid outlet holes are provided on the outer wall of the device main body. A filter screen is provided inside the device main body, and the filter screen is an annular structure arranged along the inner peripheral side wall of the device main body. The materials of the device main body and the filter screen are both stainless steel. The filtering precision of the filter screen is 50 to 300 meshes, and the aperture of the liquid outlet hole is larger than the aperture of the filtering hole of the filter screen.

2. The filtering device according to claim 1, characterized in that: The materials of the device main body and the filter screen are SUS304 or SUS316.

3. The filtering device according to claim 1, characterized in that: The cross-section of the device main body in the horizontal plane is oval, with the major axis dimension being A, the minor axis dimension being B, and the height of the device main body being H. The value range of A is 18 to 25 cm, the value range of B is 8 to 15 cm, and the value range of H is 10 to 15 cm.

4. The filtering device according to claim 3, characterized in that: A hook is further provided on the device main body, and the hook is used for hanging so that the device main body can be placed in the coating buffer tank.

5. The filtering device according to claim 4, wherein: The hook is connected to the device main body through a suspension arm. The hook includes a connected suspension part and an anti-disengagement part. The suspension part is arc-shaped, with the other end connected to the suspension arm. The anti-disengagement part is parallel to the suspension arm, and the distance between the anti-disengagement part and the suspension arm is C, and C is 2 to 3 cm.

6. The filtering device according to claim 5, wherein: There are two hooks and two suspension arms, and they correspond one by one. The two suspension arms are parallel, and the plane determined by the center lines of the two suspension arms is parallel to the major axis of the ellipse. The width of the suspension arm is W, and the distance between the two suspension arms is L. W = (0.1 - 0.2)A, and L = (0.45 - 0.55)A.

7. A coating buffer tank, characterized in that: It includes the filtering device according to any one of claims 1 - 6, a tank body, a delivery pipe and a return pipe connected to the tank body. The return pipe is arranged above the delivery pipe. The filtering device is arranged inside the tank body and is located between the return pipe and the delivery pipe. The liquid outlet of the return pipe is communicated with the open upper end of the filtering device. A stirring assembly for stirring the slurry is further provided inside the tank body.

8. The coating buffer tank according to claim 7, wherein: The distance between the lower end surface of the device main body and the highest slurry liquid level inside the tank body is S, and 0.5 mm ≤ S ≤ 1.5 mm.

9. The coating buffer tank according to claim 7, wherein: The tank body is cylindrical. The cross-section of the device main body in the horizontal plane is oval. One side of the device main body connected to the hook abuts against the inner wall of the tank body. The inner diameter of the tank body is D, and the major axis dimension of the ellipse is A, and A = (0.3 - 0.4)D.

10. The coating buffer tank according to claim 7, characterized in that: A cover body is provided on the tank body. A motor is provided on the cover body. The stirring assembly includes a stirring shaft and a stirring paddle arranged at the lower end of the stirring shaft. The upper end of the stirring shaft is connected to the motor.

Images