Lithium ion electrolyte filtering device

Abstract

The utility model discloses a lithium ion electrolyte filtering device and relates to the technical field of lithium ion electrolyte processing. Comprising a filter box and a plurality of filter plates which are sequentially arranged in the filter box from top to bottom, and the diameters of filter holes of the filter plates are sequentially reduced from top to bottom; the filtering device further comprises a first feeding pipe arranged at the top of the filtering box through a fixing rod, a second feeding pipe rotationally installed on the lower portion of the first feeding pipe, and a liquid distribution pipe horizontally arranged at the bottom end of the second feeding pipe, wherein the bottom end of the second feeding pipe rotationally penetrates through the top wall of the filtering box. The driving device is used for driving the second feeding pipe to rotate; a plurality of liquid outlet holes are formed in the bottom end of the liquid distribution pipe; the second feeding pipe drives the liquid separation pipe to rotate, so that the electrolyte in the liquid separation pipe can flow into the uppermost filter plate along the liquid separation holes, the lithium ion electrolyte is uniformly distributed on the whole filter plate, the contact area of the lithium ion electrolyte and the filter plate is increased, and the filtering efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion electrolyte processing, in particular to a lithium ion electrolyte filtering device. Background Art

[0002] Lithium-ion electrolytes are typically composed of high-purity organic solvents, electrolyte lithium salts, and necessary additives. Once the lithium-ion electrolyte is prepared, it is often necessary to filter it to remove solid impurities to effectively improve its purity.

[0003] In the prior art, in order to improve the filtration efficiency, a multi-stage filtration device is often used. In one case, the multi-stage filtration device includes a filter box and a plurality of filter plates arranged in the filter box from top to bottom. The purpose of graded filtration is achieved by setting a plurality of filter plates with different pore sizes.

[0004] However, during actual filtration, since the position of the feed pipe is fixed, after the electrolyte is introduced into the filter box along the liquid outlet end of the feed pipe, it is mainly concentrated in the filter plate area directly below the liquid outlet end of the feed pipe, which leads to the initial filtration mainly in this area. Since the electrolyte is difficult to effectively contact other areas of the filter plate during the early filtration, the filtration range of the electrolyte is reduced, which seriously affects the filtration efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a lithium ion electrolyte filtering device, so as to at least achieve the purpose of improving the filtering efficiency.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A lithium-ion electrolyte filtration device comprises a filter box and a plurality of filter plates sequentially arranged within the filter box from top to bottom, wherein the filter pores of the plurality of filter plates decrease in diameter from top to bottom. The filtration device also includes a first feed pipe mounted on the top of the filter box via a fixing rod, a second feed pipe rotatably mounted below the first feed pipe and having its bottom end rotatably extending through the top wall of the filter box, a liquid separator horizontally arranged at the bottom end of the second feed pipe, and a drive device for rotating the second feed pipe; the bottom end of the liquid separator is provided with a plurality of liquid outlets.

[0008] Preferably, the driving device includes a first gear sleeved on the outside of the second feed pipe, a second gear meshing with the first gear, a rotating rod connected to the second gear, and a motor arranged on the top wall of the filter box and connected to the rotating rod.

[0009] Preferably, the top wall of the filter box is detachably provided with a top cover, and the fixing rod, the second feed pipe and the motor are all arranged on the top cover.

[0010] Preferably, a negative pressure chamber is provided on the side wall of the filter box below the filter plate, and the negative pressure chamber is communicated with the interior of the filter box. A vacuum pump is provided outside the negative pressure chamber, and the vacuum pump is connected to a suction pipe, and the suction end of the suction pipe is communicated with the interior of the negative pressure chamber.

[0011] Preferably, the suction end of the suction pipe is higher than the lowermost filter plate.

[0012] Preferably, the filter plate includes a first stainless steel mesh layer, a filter layer and a second stainless steel mesh layer from bottom to top; a support ring is provided on the edge of the first stainless steel mesh layer, and the top of the support ring abuts against the second stainless steel mesh layer; and a sealing ring is provided on the outer wall of each support ring.

[0013] Preferably, an annular support plate is provided at the bottom edge of each filter plate, and the support plate is fixedly connected to the inner wall of the filter box.

[0014] Preferably, the pore size of the filter layer located at the top is 3-5 microns; the pore size of the filter layer located at the bottom is 0.1-1 microns.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] By arranging multiple filter plates in sequence from top to bottom inside the filter box, the lithium ion electrolyte can be filtered in multiple stages, effectively improving the filtration efficiency;

[0017] By rotatably installing the second feed pipe on the top of the filter box, horizontally arranging a separatory pipe at the lower end of the second feed pipe, arranging a plurality of liquid outlet holes at the bottom end of the separatory pipe, and arranging a driving device for driving the second feed pipe to rotate, the driving device can drive the second feed pipe to rotate during the process of adding lithium ion electrolyte to the filter box, thereby rotating the separatory pipe accordingly. During the rotation process, the lithium ion electrolyte in the separatory pipe can flow along the separatory holes onto the top filter plate. Since the separatory pipe is constantly rotating, the lithium ion electrolyte can be evenly distributed on the entire filter plate, thereby increasing the contact area between the lithium ion electrolyte and the filter plate and improving the filtration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic cross-sectional view of the embodiment 1 in the front view direction;

[0019] Figure 2 This is a schematic cross-sectional view of the structure of Example 2 in the front view direction;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the filter plate in the front view direction of Example 3;

[0021] Figure 4 for Figure 3 Schematic diagram of the structure of the middle support ring when viewed from above;

[0022] In the figure: 1-filter box, 2-filter plate, 3-first feed pipe, 4-second feed pipe, 5-separating pipe, 6-first gear, 7-second gear, 8-motor, 9-top cover, 10-negative pressure chamber, 11-vacuum pump, 12-suction pipe, 201-first stainless steel mesh layer, 202-filter layer, 203-second stainless steel mesh layer, 13-support ring, 14-support plate. DETAILED DESCRIPTION

[0023] Example 1

[0024] A lithium ion electrolyte filtering device, such as Figure 1 As shown, it includes a filter box 1, and a plurality of filter plates 2 sequentially arranged in the filter box 1 from top to bottom, and the filter pore diameters of the plurality of filter plates 2 decrease sequentially from top to bottom. The filtering device also includes a first feed pipe 3 arranged on the top of the filter box 1 through a fixed rod, a second feed pipe 4 rotatably mounted at the lower part of the first feed pipe 3 and having its bottom end rotated through the top wall of the filter box 1, a liquid separator 5 horizontally arranged at the bottom end of the second feed pipe 4, and a driving device for driving the second feed pipe 4 to rotate; a plurality of liquid outlet holes are provided at the bottom end of the liquid separator 5. Further, as Figure 1 As shown, the driving device includes a first gear 6 mounted on the outside of the second feed pipe 4, a second gear 7 meshing with the first gear 6, a rotating rod connected to the second gear 7, and a motor 8 disposed on the top wall of the filter box 1 and connected to the rotating rod. A bearing (not shown) is disposed between the liquid distribution pipe 5 and the top wall of the filter box 1. A liquid outlet pipe (not shown in the prior art) is disposed on the side wall of the filter box 1 for collecting the filtered lithium ion electrolyte.

[0025] Working principle: The lithium ion electrolyte to be filtered is added into the first feed pipe 3, then enters the separatory pipe 5 along the second feed pipe 4, and then flows along the multiple outlet holes on the separatory pipe 5 to the top filter plate 2. After multi-stage filtration through the multiple filter plates 2 arranged from top to bottom, it is discharged along the outlet pipe to collect the filtered lithium ion electrolyte.

[0026] During the entire filtration process mentioned above, the motor 8 needs to be turned on so that the motor 8 drives the rotating rod, the second gear 7 and the first gear 6 to rotate, and then the second feed pipe 4 and the liquid separation tube 5 rotate synchronously. During the rotation of the liquid separation tube 5, the lithium ion electrolyte can be evenly distributed on the entire filter plate 2, thereby increasing the contact area between the lithium ion electrolyte and the filter plate 2 and improving the filtration efficiency.

[0027] Example 2

[0028] On the basis of Example 1, Figure 2 As shown, the top wall of the filter box 1 is detachably provided with a top cover 9, so as to facilitate the inspection and maintenance of the components in the filter box 1, and to facilitate the replacement and cleaning of the filter plate 2 inside the filter box 1. In actual implementation, the top cover 9 and the filter box 1 can be firmly connected by some connecting mechanism, such as bolts. Figure 2 As shown, the fixing rod, the second feeding pipe 4 and the motor 8 are all arranged on the top cover 9. Figure 2 As shown, a negative pressure chamber 10 is provided on the side wall of the filter box 1 below the filter plate 2. The negative pressure chamber 10 is in communication with the interior of the filter box 1. A vacuum pump 11 is provided outside the negative pressure chamber 10. The vacuum pump 11 is connected to a suction pipe 12. The suction end of the suction pipe 12 is in communication with the interior of the negative pressure chamber 10. Furthermore, the suction end of the suction pipe 12 is higher than the bottom filter plate 2. This prevents the lithium ion electrolyte in the filter box 1 from contacting the suction pipe 12, thereby preventing it from being extracted from the suction pipe 12. In specific implementation, during the filtration process, the vacuum pump 11 is turned on to create a negative pressure state in the area below the filter plate 2. This can effectively increase the filtration speed.

[0029] Example 3

[0030] On the basis of Example 1 or Example 2, Figure 3 As shown, the filter plate 2 includes a first stainless steel mesh layer 201, a filter layer 202, and a second stainless steel mesh layer 203 from bottom to top. The mesh holes in the first stainless steel mesh layer 201 and the second stainless steel mesh layer 203 facilitate the smooth passage of lithium-ion electrolyte through the filter plate 2, and the mesh hole diameter is much larger than the filter hole diameter of the filter layer 202. The first stainless steel mesh layer 201 is mainly used to support the filter layer 202, and the first stainless steel mesh layer 201 and the second stainless steel mesh layer 203 jointly limit the filter layer 202. In addition, in order to ensure that the second stainless steel mesh layer 203 does not squeeze the filter layer 202, as shown in FIG. Figure 3 and Figure 4As shown, the edge of the first stainless steel mesh layer 201 is provided with a support ring 13, and the top of the support ring 13 abuts against the second stainless steel mesh layer 203. In this way, a placement cavity for the filter layer 202 can be formed between the first stainless steel mesh layer 201 and the second stainless steel mesh layer 203. The outer wall of each support ring 13 is provided with a sealing ring, which can improve the sealing between the filter plate 2 and the inner wall of the filter box 1. Furthermore, the bottom edge of each filter plate 2 is provided with an annular support plate 14, which is fixedly connected to the inner wall of the filter box 1. The support plate 14 can support the filter plate 2 and improve the filtering stability of the filter plate 2. Furthermore, in actual implementation, the filter layer 202 is pressed from a filter material. The filter material can be selected from polypropylene, nylon polytetrafluoroethylene, etc., which are all existing technologies. The actual thickness can be adjusted according to the actual filtering situation. Among them, the pore size of the filter layer 202 located at the top is 3-5 microns; the pore size of the filter layer 202 located at the bottom is 0.1-1 microns, and the pore size of the filter layer 202 in the middle layer is between the two. By limiting the pore size of the filter layer, the actual filtration requirements of the lithium-ion electrolyte can be effectively met.

Claims

1. A lithium ion electrolyte filtration device, comprising a filter box (1), and a plurality of filter plates (2) arranged in sequence from top to bottom in the filter box (1), wherein the filter pores of the plurality of filter plates (2) decrease in size from top to bottom; It is characterized in that The invention also comprises a first feed pipe (3) arranged on the top of the filter box (1) through a fixing rod, a second feed pipe (4) rotatably mounted on the lower part of the first feed pipe (3) and having its bottom end rotatably passing through the top wall of the filter box (1), a liquid separation pipe (5) horizontally arranged at the bottom end of the second feed pipe (4), and a driving device for driving the second feed pipe (4) to rotate; and a plurality of liquid outlet holes are provided at the bottom end of the liquid separation pipe (5).

2. A lithium ion electrolyte filtration device according to claim 1, characterized in that: The driving device comprises a first gear (6) sleeved on the outside of the second feed pipe (4), a second gear (7) meshed with the first gear (6), a rotating rod connected to the second gear (7), and a motor (8) arranged on the top wall of the filter box (1) and connected to the rotating rod.

3. A lithium ion electrolyte filtration device according to claim 2, characterized in that: The top wall of the filter box (1) is detachably provided with a top cover (9), and the fixing rod, the second feed pipe (4) and the motor (8) are all arranged on the top cover (9).

4. The lithium ion electrolyte filtration device according to claim 1, characterized in that: A negative pressure chamber (10) is provided on the side wall of the filter box (1) below the filter plate (2), and the negative pressure chamber (10) is communicated with the interior of the filter box (1). A vacuum pump (11) is provided outside the negative pressure chamber (10), and the vacuum pump (11) is connected to a suction pipe (12), and the suction end of the suction pipe (12) is communicated with the interior of the negative pressure chamber (10).

5. The lithium ion electrolyte filtering device according to claim 4, characterized in that: The suction end of the suction pipe (12) is higher than the lowermost filter plate (2).

6. The lithium ion electrolyte filtering device according to claim 1, characterized in that: The filter plate (2) comprises, from bottom to top, a first stainless steel mesh layer (201), a filter layer (202) and a second stainless steel mesh layer (203); a support ring (13) is provided on the edge of the first stainless steel mesh layer (201), and the top end of the support ring (13) abuts against the second stainless steel mesh layer (203); and a sealing ring is provided on the outer wall of each support ring (13).

7. The lithium ion electrolyte filtering device according to claim 6, characterized in that: The bottom edge of each filter plate (2) is provided with an annular support plate (14), and the support plate (14) is fixedly connected to the inner wall of the filter box (1).

8. The lithium ion electrolyte filtering device according to claim 6, characterized in that: The filter pore size of the uppermost filter layer (202) is 3-5 microns; the filter pore size of the lowermost filter layer (202) is 0.1-1 microns.

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