Battery slurry filtering device

Abstract

The utility model provides a battery slurry filtering device, which belongs to the technical field of battery production and manufacturing and comprises a device body, the device body comprises at least one filtering cavity, a rotatable rotating filtering plate is mounted at the bottom of the filtering cavity, a plurality of main filtering holes are formed in the rotating filtering plate, a rotatable stirring net is mounted in the filtering cavity, and the stirring net is arranged in the filtering cavity. A plurality of pre-filtering holes are formed in the stirring net, and the preset rotating direction of the stirring net is opposite to the preset rotating direction of the rotary filtering plate; the slurry filtering device has the beneficial effects that the pre-filtering holes in the stirring net can be used for pre-treating agglomerated large-particle materials in slurry, and the slurry is subjected to transverse shearing force in the filtering process due to the reverse movement of the stirring net and the rotary filtering plate; and agglomerated large-particle materials in contact with the rotary filter plate in the slurry are crushed or hit away, so that the agglomerated large-particle materials are prevented from blocking the filter device.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery production and manufacturing technical field relates to a kind of battery slurry filtering device. BACKGROUND

[0002] Lithium-ion batteries have been widely used in electric vehicles, energy storage systems and aerospace fields due to their excellent safety performance, long cycle life and environmental friendliness. With the development of battery technology, the positive and negative electrode materials are refined to nanoscale. Lithium-ion battery slurry is mainly composed of active materials, solvents, binders, conductive agents, dispersants and other components prepared by mixing and stirring. However, in the actual production process, a large number of agglomerated particles often appear in the slurry, which leads to the easy blockage of the filter device, reduces the stability of the coating process, and greatly affects the performance of the product, thereby affecting the consistency of the electrochemical performance of lithium-ion batteries.

[0003] The current mainstream filter device has low filtering efficiency and is easy to block. Personnel need to clean the screen frequently during the first slurry coating process, which makes it difficult to achieve continuous and stable filtration of the slurry, and restricts the improvement of the quality of the electrode coating and the yield of battery manufacturing. SUMMARY

[0004] The utility model aims at the above-mentioned problems existing in prior art, and proposes a kind of battery slurry filtering device.

[0005] The utility model can achieve the purpose by the following technical scheme: a kind of battery slurry filtering device, comprising:

[0006] The device body includes at least one filter cavity, the bottom of the filter cavity is provided with a rotatable rotary filter plate, the rotary filter plate is provided with a plurality of main filter holes, the filter cavity is provided with a rotatable stirring net, the stirring net is provided with a plurality of pre-filtering holes, and the preset rotating direction of the stirring net is opposite to the preset rotating direction of the rotary filter plate.

[0007] Preferably, the filter straight cylinder is rotatably connected with the rotary filter plate, the filter straight cylinder is provided as a hollow structure, and a plurality of side filter holes are formed in the cylinder wall of the filter straight cylinder.

[0008] Preferably, the filter straight cylinder and the stirring net are fixedly connected through a connecting rod, the filter straight cylinder is provided with a first driving rod, the first driving rod is coaxially arranged with the filter straight cylinder, the connecting rod is fixedly connected with the first driving rod, and the first driving rod can drive the filter straight cylinder and the stirring net to rotate synchronously through the connecting rod.

[0009] Preferably, the pre-filtering hole has a larger aperture than the main filter hole and the side filter hole.

[0010] Preferably, the number of the filtering cavities is at least two, and each of the filtering cavities is connected in series to form a multi-stage filtering structure.

[0011] Preferably, the aperture of the main filtering hole of each of the rotating filtering plates gradually decreases along the slurry flow path.

[0012] Preferably, the filtering straight tubes in two adjacent filtering cavities are connected, and the two adjacent filtering cavities are also connected through the filtering straight tubes.

[0013] Preferably, the device further comprises a driving mechanism, the driving mechanism comprises a first driving element and a second driving element, the output shaft of the first driving element is connected with a first driving rod and can drive the first driving rod to rotate, the rotating filtering plate is provided with a second driving rod, and the second driving element is connected with the second driving rod and can drive the rotating filtering plate to rotate through the second driving rod.

[0014] Preferably, the device body comprises a top cover, a filtering cylinder and a bottom shell, the first driving element and the second driving element are arranged on the top cover, the filtering cavities are arranged in the filtering cylinder, and the top cover and the bottom shell are arranged on the top and bottom of the filtering cylinder respectively.

[0015] Preferably, the filtering cylinder comprises one cylinder body, or the filtering cylinder comprises at least two cylinder bodies, and each of the cylinder bodies is connected in series, and each of the cylinder bodies is provided with one filtering cavity.

[0016] Compared with the prior art, the device has the following beneficial effects:

[0017] 1. The pre-filtering holes on the stirring net can pre-treat the large agglomerated particles in the slurry, and the reverse movement of the stirring net and the rotating filtering plate can make the slurry be subjected to shearing force in the filtering process, so that the large agglomerated particles in the slurry that contact the rotating filtering plate are crushed or knocked off, thereby avoiding the large agglomerated particles from blocking the filtering device.

[0018] 2. The main filtering holes and the side filtering holes constitute a filtering structure for filtering the slurry, the side filtering holes are arranged to effectively increase the total filtering area, improve the overall filtering efficiency, disperse the filtering load and reduce the possibility of blocking.

[0019] 3. The pre-filtering holes have a large aperture, which is arranged to better intercept / capture the large agglomerated particles on the stirring net, thereby pre-treating a part of the large agglomerated particles in the slurry, and facilitating the main filtering holes and the side filtering holes with small apertures to perform fine filtering on the slurry. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure schematic view of the cylinder body of the utility model.

[0021] Figure 2 It is a structure schematic view of another view angle of the cylinder body of the utility model.

[0022] Figure 3 It is a structure schematic view of another cylinder body of the utility model.

[0023] Figure 4 It is an internal structure schematic view of the battery slurry filtering device of the utility model.

[0024] Figure 5 It is a structure schematic view of the battery slurry filtering device of the utility model.

[0025] Figure 6 It is an exploded view of the structure of the battery slurry filtering device of the utility model.

[0026] In the figure, 100, top cover;110, first driving element;120, second driving element;200, filter cylinder;210, cylinder body;211, filter cavity;300, bottom shell;400, rotary filter plate;410, main filter hole;420, second driving rod;500, stirring net;510, pre-filtering hole;600, filter straight cylinder;610, side filter hole;620, connecting rod;630, first driving rod. DETAILED DESCRIPTION

[0027] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0028] As Figures 1 to 6 shown, a battery slurry filtering device, comprising: device body, the device body includes at least one filter cavity 211, the bottom of filter cavity 211 is installed with rotatable rotary filter plate 400, rotary filter plate 400 is opened with several main filter holes 410, filter cavity 211 is installed with rotatable stirring net 500, stirring net 500 is opened with several pre-filtering holes 510, the preset rotation direction of stirring net 500 is opposite with the preset rotation direction of rotary filter plate 400.

[0029] The rotary filter plate 400 is a disc structure, and the gap between the outer edge surface of the rotary filter plate 400 and the inner wall surface of the filter cavity 211 is extremely small. On the premise of ensuring that the rotary filter plate 400 is not interfered during rotation, the agglomeration of large particle materials in the slurry is prevented from leaving the filter cavity 211 through the gap between the inner wall surface of the filter cavity 211 and the rotary filter plate 400. A plurality of main filter holes 410 are formed in the rotary filter plate 400, which are used for filtering the slurry. The stirring net 500 is provided with as many pre-filter holes 510 as possible, which are used for pre-filtering the slurry in the filter cavity 211, and a part of the large particle materials in the slurry are intercepted / captured on the stirring net 500, so as to avoid blocking the main filter holes 410.

[0030] The stirring net 500 can rotate, and this design can drive the slurry to rotate in the filter cavity 211. Since the preset rotation direction of the stirring net 500 is opposite to the preset rotation direction of the rotary filter plate 400, the slurry is subjected to the shearing force of the rotary filter plate 400 during rotation, so that the large particle materials at the contact surface between the slurry and the rotary filter plate 400 are crushed and knocked off, thereby avoiding blocking the main filter holes 410. At the same time, the relative speed of the stirring net 500 and the rotary filter plate 400 can be controlled, so as to control the filtering speed of the slurry, and the purpose of fine filtering is achieved. In addition, the filter holes can be prevented from being blocked.

[0031] From the principle of preventing blockage, the pre-filter holes 510 on the stirring net 500 first perform preliminary screening on the slurry entering the filter cavity 211. These pre-filter holes 510 can capture a part of the large particle materials in the slurry, so as to ensure that only smaller particles or liquid can pass through, thereby reducing the load in the subsequent filtering step and reducing the number of times of cleaning the filtering device due to blockage. When the stirring net 500 and the rotary filter plate 400 rotate in opposite directions, a strong shearing force is generated in the area between them. On the one hand, the agglomerated large particle materials can be crushed into smaller particles. On the other hand, part of the agglomerated large particle materials can be “knocked off” from the surface of the rotary filter plate 400 due to the shearing force, thereby avoiding the risk of these particles blocking the filter holes.

[0032] As shown in FIGS. 1 to 3, the filter cavity 211 is provided with a rotary filter plate 400 and a stirring net 500. The rotary filter plate 400 is rotatably connected to the filter cavity 211, and the stirring net 500 is rotatably connected to the rotary filter plate 400. Figures 1 to 4 、 Figure 6 As shown in FIGS. 1 to 3, the filter cavity 211 is provided with a rotary filter plate 400 and a stirring net 500. The rotary filter plate 400 is rotatably connected to the filter cavity 211, and the stirring net 500 is rotatably connected to the rotary filter plate 400.

[0033] The filter straight cylinder 600 is a cylindrical structure capable of rotating in the filter cavity 211, and has openings at both ends. The filter straight cylinder 600 and the rotating filter plate 400 can be connected through a bearing or other rotating support structure, so that the filter straight cylinder 600 can rotate relative to the rotating filter plate 400. The filter straight cylinder 600 allows the slurry to pass through the side filter holes 610 on the cylinder wall from the inside of the filter cavity 211, and the slurry that meets the size requirements can pass through smoothly, while larger particles are blocked outside. This design greatly increases the filter area and reduces the possibility of clogging.

[0034] It should be noted here that the pre-filter holes 510 on the stirring net 500 are mainly used to preliminarily process a part of the agglomerated large particle materials, so as to avoid these larger particles from entering the subsequent fine filtering stage. In this way, the main filter holes 410 and the side filter holes 610 are protected from the risk of being clogged by large particles, and the burden on the entire system is also reduced. The main filter holes 410 and the side filter holes 610 constitute the filter structure for filtering the slurry, and the side filter holes 610 are provided to effectively increase the total filter area, improve the overall filtering efficiency, and disperse the filter load to reduce the possibility of clogging.

[0035] On the basis of the above-mentioned embodiments, the filter straight cylinder 600 and the stirring net 500 are fixedly connected through a connecting rod 620, and the filter straight cylinder 600 is provided with a first driving rod 630 coaxially arranged with the filter straight cylinder 600. The connecting rod 620 is fixedly connected with the first driving rod 630, and the first driving rod 630 can drive the filter straight cylinder 600 and the stirring net 500 to rotate synchronously through the connecting rod 620.

[0036] The connecting rod 620 serves to connect the first driving rod 630, the filter straight cylinder 600 and the stirring net 500. Since the filter straight cylinder 600 and the stirring net 500 are fixedly connected together through the connecting rod 620, and the connecting rod 620 is connected with the first driving rod 630, when the first driving rod 630 is driven to rotate by an external power, the connecting rod 620 will be driven to rotate, and then the filter straight cylinder 600 and the stirring net 500 will also rotate synchronously.

[0037] On the basis of the above-mentioned embodiments, the pre-filter holes 510 have a larger diameter than the main filter holes 410 and the side filter holes 610.

[0038] By the pre-filtering hole 510 with a larger aperture and the main filtering hole 410 and the side filtering hole 610 with smaller apertures, a part of large-particle materials can be removed in advance, so as to effectively protect the finer filtering holes from being blocked by large-particle materials. The reason why the pre-filtering hole 510 has a larger aperture is to better intercept / capture the agglomerated large-particle materials on the stirring net 500, so as to pre-treat a part of the agglomerated large-particle materials, facilitating the subsequent fine filtering of the slurry by the main filtering hole 410 and the side filtering hole 610 with smaller apertures.

[0039] On the basis of the above-mentioned embodiments, the number of the filtering cavities 211 is at least two, and each filtering cavity 211 is sequentially connected in series and forms a multi-stage filtering structure, and the adjacent two filtering cavities 211 are communicated through the main filtering holes 410 of the rotating filtering plates 400 between the two filtering cavities 211.

[0040] By the multi-stage filtering, different sizes of particles can be effectively removed in stages, so that the particle size of the slurry flowing out of the discharge port can meet the coating requirements. Each stage of filtering helps to protect the next stage of filtering components from direct impact of large particles, so that the device is not easy to be blocked, and personnel do not need to clean the screen frequently during a slurry coating process, so as to realize continuous and stable filtering of the slurry and ensure the quality of the pole piece coating and the battery manufacturing yield.

[0041] On the basis of the above-mentioned embodiments, the apertures of the main filtering holes 410 of each rotating filtering plate 400 gradually decrease along the slurry flow path.

[0042] By gradually reducing the apertures of the filtering holes (the main filtering holes 410, the side filtering holes 610 and the pre-filtering holes 510) in each filtering cavity 211, the slurry can be gradually purified. Each stage of filtering can remove particles within a specific size range, so as to ensure that the finally output slurry reaches a higher purity. This grading filtering method can effectively process different sizes of particles from larger to smaller, so that the particle size of the slurry flowing out of the discharge port can meet the coating requirements.

[0043] For example, in the previous stage of the filtering cavity 211, the aperture of the pre-filtering hole 510 is 80-100um, and the apertures of the main filtering hole 410 and the side filtering hole 610 are 70-80um; then in the next stage of the filtering cavity 211, the aperture of the pre-filtering hole 510 is 60-70um, and the apertures of the main filtering hole 410 and the side filtering hole 610 are 40-55um.

[0044] On the basis of the above-mentioned embodiments, the filtering straight cylinders 600 in the adjacent two filtering cavities 211 are communicated, and the adjacent two filtering cavities 211 are also communicated through the filtering straight cylinders 600.

[0045] The slurry can not only leave the filter cavity 211 through the main filter hole 410, but also leave the filter cavity 211 through the side filter hole 610, thereby achieving the purpose of increasing the total filter area, and increasing the filter area helps to improve the filtering efficiency, because more slurry can be processed at the same time.

[0046] As shown in Figures 1 to 4 , Figure 6 , on the basis of the above embodiment, a driving mechanism is further included, the driving mechanism includes a first driving element 110 and a second driving element 120, the output shaft of the first driving element 110 is connected with the first driving rod 630 and can drive the first driving rod 630 to rotate, the rotating filter plate 400 is provided with a second driving rod 420, and the second driving element 120 is connected with the second driving rod 420 and can drive the rotating filter plate 400 to rotate through the second driving rod 420.

[0047] The first driving element 110 is preferably a first motor, and the output shaft of the first motor is connected with the first driving rod 630. The second driving element 120 is preferably a gear ring and at least one second motor, the output shaft of the second motor is provided with a gear, the gear is engaged with the gear ring, the second driving rod 420 is fixedly connected with the gear ring, and the gear ring is coaxially arranged with the rotating filter plate 400, the second motor can drive the gear ring to rotate, and the gear ring can drive the rotating filter plate 400 to rotate through the second driving rod 420 when rotating.

[0048] The main role of the first driving element 110 is to provide power to drive the first driving rod 630 to rotate. Since the first driving rod 630 is fixedly connected with the connecting rod 620, and the connecting rod 620 is connected with the filter straight cylinder 600 and the stirring net 500, the rotation of the first driving rod 630 will drive the filter straight cylinder 600 and the stirring net 500 to rotate synchronously. The second driving element 120 is responsible for providing an independent power source for the rotating filter plate 400, so that it can rotate according to the preset direction and speed. This design allows the rotating filter plate 400 to rotate independently of the filter straight cylinder 600 and the stirring net 500.

[0049] It needs to be supplemented here that for the design of multiple filter cavities 211, all the first driving rods 630 are connected in sequence, that is, the first driving element 110 can drive all the first driving rods 630 as long as it drives one first driving rod 630; similarly, all the second driving rods 420 are connected, so that all the rotating filter plates 400 are fixedly connected in the circumferential direction, and the second driving element 120 only needs to drive one rotating filter plate 400 to rotate, that is, it can drive all the rotating filter plates 400 to rotate.

[0050] As shown in Figures 1 to 6As shown, on the basis of the above embodiment, the device body comprises a top cover 100, a filter cylinder 200 and a bottom shell 300, the first driving element 110 and the second driving element 120 are arranged on the top cover 100, the filter cavity 211 is located in the filter cylinder 200, and the top cover 100 and the bottom shell 300 are respectively arranged on the top and bottom of the filter cylinder 200.

[0051] The top cover 100 is provided with a feeding port, and the slurry can enter the filter cavity 211 at the top of the filter cylinder 200 through the feeding port of the top cover 100. The bottom shell 300 is provided with a discharging port, and the slurry filtered by each layer of filter cavities 211 enters the bottom shell 300 and is discharged through the discharging port.

[0052] On the basis of the above embodiment, the filter cylinder 200 comprises one cylinder body 210, or the filter cylinder 200 comprises at least two cylinder bodies 210, and each cylinder body 210 is connected in sequence, and each cylinder body 210 is provided with a filter cavity 211.

[0053] In the design of multiple cylinder bodies 210, each cylinder body 210 can be disassembled and assembled, so as to enhance the flexibility of the device. In addition, the number of cylinder bodies 210 is determined by the number of filtering stages, if twice filtering is required, two cylinder bodies 210 can be arranged, and the design allows the slurry to be gradually purified in multiple stages, and each filter cavity 211 can be provided with different filtering standards (such as filter holes of different sizes) according to actual needs, so as to realize higher filtering effect, so that the particle size of the slurry particles at the discharging port can meet the coating requirements.

[0054] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0055] In addition, the description of "first", "second", "one" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0056] In the utility model, unless another definite provision and limitation, the term "connect", "fix" and so on should do the broad sense understanding, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation.For the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0057] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

Claims

1. A battery slurry filtration device, characterized in that, include: The device body includes at least one filter chamber (211), and a rotatable rotating filter plate (400) is installed at the bottom of the filter chamber (211). The rotating filter plate (400) has a plurality of main filter holes (410). A rotatable stirring net (500) is installed inside the filter chamber (211). The stirring net (500) has a plurality of pre-filter holes (510). The preset rotation direction of the stirring net (500) is opposite to the preset rotation direction of the rotating filter plate (400).

2. The battery slurry filtration device as described in claim 1, characterized in that: The filter chamber (211) is also equipped with a filter cylinder (600), which is rotatably connected to the rotating filter plate (400). The filter cylinder (600) is configured as a hollow structure, and the cylinder wall of the filter cylinder (600) is provided with a plurality of side filter holes (610).

3. The battery slurry filtration device as described in claim 2, characterized in that: The filter cylinder (600) and the stirring screen (500) are fixedly connected by a connecting rod (620). A first driving rod (630) is provided inside the filter cylinder (600). The first driving rod (630) is coaxially arranged with the filter cylinder (600). The connecting rod (620) is fixedly connected to the first driving rod (630). The first driving rod (630) can drive the filter cylinder (600) and the stirring screen (500) to rotate synchronously through the connecting rod (620).

4. The battery slurry filtration device as described in claim 2, characterized in that: The diameter of the pre-filter hole (510) is larger than the diameter of the main filter hole (410) and the diameter of the side filter hole (610).

5. The battery slurry filtration device as described in claim 2, characterized in that: The number of filter chambers (211) is at least two, and each filter chamber (211) is connected in series to form a multi-stage filtration structure. Two adjacent filter chambers (211) are connected through the main filter hole (410) of the rotating filter plate (400) between them.

6. The battery slurry filtration device as described in claim 5, characterized in that: The aperture of the main filter hole (410) of each of the rotating filter plates (400) gradually decreases along the slurry flow path.

7. The battery slurry filtration device as described in claim 5, characterized in that: The filter cylinders (600) in two adjacent filter chambers (211) are connected.

8. The battery slurry filtration device as described in claim 3, characterized in that: It also includes a drive mechanism, which includes a first drive element (110) and a second drive element (120). The output shaft of the first drive element (110) is connected to the first drive rod (630) and can drive the first drive rod (630) to rotate. The rotating filter plate (400) is provided with a second drive rod (420). The second drive element (120) is connected to the second drive rod (420) and can drive the rotating filter plate (400) to rotate through the second drive rod (420).

9. The battery slurry filtration device as described in claim 8, characterized in that: The device body includes a top cover (100), a filter cylinder (200), and a bottom shell (300). The first driving element (110) and the second driving element (120) are both disposed on the top cover (100). The filter chamber (211) is located inside the filter cylinder (200). The top cover (100) and the bottom shell (300) are respectively installed on the top and bottom of the filter cylinder (200).

10. The battery slurry filtration device as described in claim 9, characterized in that: The filter cylinder (200) includes a cylinder body (210); or the filter cylinder (200) includes at least two cylinder bodies (210), which are connected in sequence; each cylinder body (210) has a filter chamber (211).

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