Multistage crystallization device for preparing lithium hexafluorophosphate for lithium battery

By designing a multi-stage crystallization device, including a stirring module and a multi-stage crystallization module, the problem of low crystallization efficiency for lithium hexafluorophosphate preparation in lithium batteries in the prior art is solved, and a more efficient crystallization process and quality is achieved.

CN222854649UActive Publication Date: 2025-05-13SHAOWU YONGTAI HI-TECH MATERIAL CO LTD
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Patent Information

Application Number
CN202421380026.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-17
Publication Date
2025-05-13
Estimated Expiration
2034-06-17

AI Technical Summary

Technical Problem

In practical applications, the crystallization devices prepared from lithium hexafluorophosphate of lithium batteries have different crystal quality and low efficiency.

Method used

A multi-stage crystallization device is designed, including a stirring assembly and a multi-stage crystallization assembly. The stirring module realizes sufficient stirring of the reaction mother liquor in the kettle body through the cooperation of the stirring rod and the scraper; the multi-stage crystallization module realizes reduced pressure and solvent evaporation through a vacuum pump and an evaporation device, thereby improving crystallization efficiency.

Benefits of technology

Through the use of multi-stage crystallization devices, the crystallization quality and efficiency of lithium hexafluorophosphate are significantly improved, and the problem of low use efficiency of a single crystallizer is solved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of lithium hexafluorophosphate preparation and crystallization, and discloses a multi-stage crystallization device for preparing lithium hexafluorophosphate for a lithium battery, which comprises a bottom column, and a kettle body is fixedly mounted at the top of the bottom column; the stirring assembly is fixedly mounted at the top of the kettle body; wherein the stirring assembly comprises a feeding part and a stirring part; the multi-stage crystallization assembly is arranged in the kettle body; wherein the multi-stage crystallization assembly comprises a multi-stage crystallization part and a collection part; and the feeding part comprises a feeding hopper. According to the utility model, the concentration of solute is increased by arranging the multi-stage crystallization parts and the evaporation device to work and evaporating the solvent, so that the crystallization, the starting of the vacuum pump and the operation in a pressure reduction state and under a pressure reduction condition in the kettle body are realized, the boiling point of the solution can be reduced, the evaporation and crystallization process of the solvent is accelerated, and the effect of accelerating the crystallization efficiency is achieved.
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Description

Technical Field

[0001] The utility model relates to the technical field of lithium hexafluorophosphate preparation crystallization, in particular to a multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium batteries. Background Art

[0002] Lithium hexafluorophosphate is an inorganic compound with the chemical formula LiPF6. It is a white crystalline powder that is easily soluble in water, low-concentration methanol, ethanol, acetone, carbonates and other organic solvents. It is mainly used as an electrolyte material for lithium-ion batteries.

[0003] At present, in the actual application of crystallization equipment for preparing lithium hexafluorophosphate for lithium batteries, the crystallization preparation of lithium hexafluorophosphate generally uses a crystallizer to achieve the purpose of crystallization. However, the quality of crystals generated by different crystallizers is different, and the use of a single crystallizer is less efficient for the crystallization preparation of lithium hexafluorophosphate. Utility Model Content

[0004] The purpose of the utility model is to provide a multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium batteries, so as to achieve the purpose of solving the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium batteries, comprising a bottom column, a kettle body is fixedly installed on the top of the bottom column;

[0006] A stirring assembly, wherein the stirring assembly is fixedly mounted on the top of the kettle body;

[0007] Wherein, the stirring component includes a feeding part and a stirring part;

[0008] A multi-stage crystallization assembly, wherein the multi-stage crystallization assembly is arranged inside the kettle body;

[0009] Wherein, the multi-stage crystallization component includes a multi-stage crystallization part and a collection part.

[0010] Preferably, the feeding part includes a feeding hopper, a plunger is movably installed inside the feeding hopper, a sealing ring is arranged inside the kettle body, a top cover is fixedly installed on the top of the kettle body, the feeding hopper is fixedly installed on the top of the top cover, the feeding hopper is connected with the top cover, the plunger is matched with the feeding hopper, and the sealing ring is sleeved and installed on one end of the top cover close to the bottom.

[0011] Preferably, the stirring part includes a rotating shaft, a connecting rod is fixedly installed in the middle of the rotating shaft, a scraper is fixedly installed at one end of the connecting rod, stirring rods are fixedly installed at both ends of the rotating shaft, and a motor is fixedly installed at the top of the rotating shaft.

[0012] Preferably, the rotating shaft is arranged inside the kettle body, and is movably installed between the rotating shaft and the top cover, the top end of the rotating shaft passes through the kettle body and the top cover in sequence, and the top end of the rotating shaft extends to the top of the top cover, the scraping surface of the scraper is in contact with the inner wall of the kettle body, and the motor is fixedly installed on the top of the top cover.

[0013] Preferably, the multi-stage crystallization part includes a vacuum pump, a connecting pipe is fixedly installed on the bottom end of the vacuum pump, a connecting end is fixedly installed on the left side of the connecting pipe, a barometer is fixedly installed on the left side of the connecting end, a pressure valve is provided on the top of the kettle body, and an evaporation device is fixedly installed inside the kettle body.

[0014] Preferably, the vacuum pump is arranged on the top of the top cover, the vacuum pump and the top cover are fixedly installed through a frame, the bottom end of the connecting pipe passes through the top cover and extends to the inside of the top cover, and the air pressure valve is fixedly installed on the top of the top cover.

[0015] Preferably, the collecting part comprises a collecting frame, a filter screen is arranged on the top of the collecting frame, a frame body is arranged on the top of the collecting frame, a discharge hopper is fixedly installed on the bottom of the kettle body, and a valve is fixedly installed inside the discharge hopper.

[0016] Preferably, the collecting frame is arranged at the bottom of the kettle body, the collecting frame and the bottom column are movably installed by snapping, the filter screen is fixedly installed inside the frame, the frame and the bottom column are movably installed by snapping, the discharge hopper is connected with the inside of the kettle body, and the filter screen is arranged directly above the collecting frame.

[0017] The utility model provides a multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium batteries. It has the following beneficial effects:

[0018] (1) The utility model sets a stirring part, starts the motor, rotates the shaft, drives the connecting rod to rotate, and then drives the scraper to rotate, scrapes the inner wall of the kettle body, and at the same time, the stirring rod rotates to stir the reaction mother liquid inside the kettle body, thereby achieving the effect of facilitating the crystallization of lithium hexafluorophosphate.

[0019] (2) The utility model sets a multi-stage crystallization part, and the evaporation device works to increase the concentration of the solute by evaporating the solvent, thereby achieving crystallization. The vacuum pump is started, and the interior of the kettle is in a reduced pressure state. Operation under reduced pressure conditions can reduce the boiling point of the solution, thereby accelerating the evaporation and crystallization process of the solvent, thereby achieving the effect of accelerating the crystallization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 This is a view of the internal structure of the utility model;

[0022] Figure 3 This is a front view of the utility model;

[0023] Figure 4 For this utility model Figure 3 A partial enlarged view of center A.

[0024] In the figure: 1 bottom column, 2 kettle body, 3 stirring assembly, 31 feeding part, 311 feeding hopper, 312 plunger, 313 sealing ring, 314 top cover, 32 stirring part, 321 rotating shaft, 322 connecting rod, 323 scraper, 324 stirring rod, 325 motor, 4 multi-stage crystallization assembly, 41 multi-stage crystallization part, 411 vacuum pump, 412 connecting pipe, 413 connecting end, 414 barometer, 415 pressure valve, 416 evaporation device, 42 collecting part, 421 collecting frame, 422 filter screen, 423 frame, 424 discharging hopper, 425 valve. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] Example 1

[0028] The preferred embodiment of the multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium batteries provided by the utility model is as follows Figure 1-4 As shown: A multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium batteries, comprising

[0029] A bottom column 1, a kettle body 2 is fixedly installed on the top of the bottom column 1;

[0030] A stirring assembly 3, wherein the stirring assembly 3 is fixedly mounted on the top of the kettle body 2;

[0031] The stirring component 3 includes a feeding part 31 and a stirring part 32;

[0032] The feeding part 31 includes a feeding hopper 311, a plunger 312 is movably installed inside the feeding hopper 311, a sealing ring 313 is arranged inside the kettle body 2, a top cover 314 is fixedly installed on the top of the kettle body 2, the feeding hopper 311 is fixedly installed on the top of the top cover 314, the feeding hopper 311 and the top cover 314 are connected, the plunger 312 and the feeding hopper 311 are adapted, and the sealing ring 313 and the end of the top cover 314 near the bottom are sleeved and installed; remove the plunger 312, and add the reaction mother liquid into the kettle body 2 through the feeding hopper 311;

[0033] The stirring part 32 includes a rotating shaft 321, a connecting rod 322 is fixedly installed in the middle of the rotating shaft 321, a scraper 323 is fixedly installed at one end of the connecting rod 322, stirring rods 324 are fixedly installed at both ends of the rotating shaft 321, and a motor 325 is fixedly installed at the top of the rotating shaft 321. The rotating shaft 321 is arranged inside the kettle body 2, and is movably installed between the rotating shaft 321 and the top cover 314. The top of the rotating shaft 321 passes through the kettle body 2 and the top cover 314 in sequence, and the top of the rotating shaft 321 extends to the top of the top cover 314. The scraping surface of the scraper 323 contacts the inner wall of the kettle body 2, and the motor 325 is fixedly installed on the top of the top cover 314; start the motor 325, the rotating shaft 321 rotates, drives the connecting rod 322 to rotate, thereby drives the scraper 323 to rotate, scrapes the inner wall of the kettle body 2, and at the same time the stirring rod 324 rotates to stir the reaction mother liquid inside the kettle body 2, so as to facilitate the crystallization of lithium hexafluorophosphate.

[0034] Example 2

[0035] On the basis of Example 1, a preferred embodiment of a multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium batteries provided by the utility model is as follows Figure 1-4 As shown: a multi-stage crystallization assembly 4, the multi-stage crystallization assembly 4 is arranged inside the kettle body 2;

[0036] The multi-stage crystallization assembly 4 includes a multi-stage crystallization part 41 and a collection part 42;

[0037] The multi-stage crystallization part 41 includes a vacuum pump 411, a connecting pipe 412 is fixedly installed at the bottom end of the vacuum pump 411, a connecting end 413 is fixedly installed on the left side of the connecting pipe 412, a barometer 414 is fixedly installed on the left side of the connecting end 413, a pressure valve 415 is arranged on the top of the kettle body 2, an evaporation device 416 is fixedly installed inside the kettle body 2, the vacuum pump 411 is arranged on the top of the top cover 314, the vacuum pump 411 and the top cover 314 are fixedly installed through a frame, the bottom end of the connecting pipe 412 passes through the top cover 314 and extends to the inside of the top cover 314, and the pressure valve 415 is fixedly installed on the top of the top cover 314; the evaporation device 416 works to increase the concentration of the solute by evaporating the solvent, thereby achieving crystallization, and the vacuum pump 411 is started, the inside of the kettle body 2 is in a reduced pressure state, and the operation under reduced pressure conditions can reduce the boiling point of the solution, thereby accelerating the evaporation and crystallization process of the solvent;

[0038] The collecting part 42 includes a collecting frame 421, a filter screen 422 is arranged on the top of the collecting frame 421, a frame body 423 is arranged on the top of the collecting frame 421, a discharge hopper 424 is fixedly installed on the bottom of the kettle body 2, a valve 425 is fixedly installed inside the discharge hopper 424, the collecting frame 421 is arranged at the bottom of the kettle body 2, the collecting frame 421 and the bottom column 1 are movably installed by snap connection, the filter screen 422 is fixedly installed inside the frame body 423, the frame body 423 and the bottom column 1 are movably installed by snap connection, the discharge hopper 424 is connected with the inside of the kettle body 2, and the filter screen 422 is arranged just above the collecting frame 421; open the valve 425, the crystals are discharged through the discharge hopper 424 and fall into the inside of the frame body 423, and the excess uncrystallized reaction mother liquor falls into the collection frame 421 through the filter screen 422, so as to facilitate the secondary utilization of the reaction mother liquor.

[0039] When in use, remove the plunger 312, add the reaction mother liquor into the kettle body 2 through the feed hopper 311, start the motor 325, rotate the shaft 321, drive the connecting rod 322 to rotate, thereby drive the scraper 323 to rotate, scrape the inner wall of the kettle body 2, and at the same time, rotate the stirring rod 324 to stir the reaction mother liquor in the kettle body 2 to facilitate the crystallization of lithium hexafluorophosphate. The evaporation device 416 works to increase the concentration of the solute by evaporating the solvent, thereby achieving crystallization. Start the vacuum pump 411, and the inside of the kettle body 2 is in a reduced pressure state. Operation under reduced pressure conditions can reduce the boiling point of the solution, thereby accelerating the evaporation and crystallization process of the solvent. Open the valve 425, and the crystals are discharged through the discharge hopper 424 and fall into the frame 423. The excess uncrystallized reaction mother liquor falls into the collection frame 421 through the filter screen 422 for secondary utilization of the reaction mother liquor.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium batteries, characterized in that: It comprises a bottom column (1), a kettle body (2) is fixedly mounted on the top of the bottom column (1); A stirring assembly (3), wherein the stirring assembly (3) is fixedly mounted on the top of the kettle body (2); Wherein, the stirring component (3) comprises a feeding part (31) and a stirring part (32); A multi-stage crystallization assembly (4), wherein the multi-stage crystallization assembly (4) is arranged inside the kettle body (2); Wherein, the multi-stage crystallization component (4) comprises a multi-stage crystallization part (41) and a collection part (42).

2. A multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium battery according to claim 1, characterized in that: The feeding part (31) comprises a feeding hopper (311), a plunger (312) is movably installed inside the feeding hopper (311), a sealing ring (313) is arranged inside the kettle body (2), a top cover (314) is fixedly installed on the top of the kettle body (2), the feeding hopper (311) is fixedly installed on the top of the top cover (314), the feeding hopper (311) and the top cover (314) are connected, the plunger (312) and the feeding hopper (311) are matched with each other, and the sealing ring (313) is sleeved and installed on one end of the top cover (314) close to the bottom.

3. The multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium battery according to claim 1, characterized in that: The stirring portion (32) comprises a rotating shaft (321), a connecting rod (322) is fixedly mounted in the middle of the rotating shaft (321), a scraper (323) is fixedly mounted at one end of the connecting rod (322), stirring rods (324) are fixedly mounted at both ends of the rotating shaft (321), and a motor (325) is fixedly mounted at the top end of the rotating shaft (321).

4. A multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium battery according to claim 3, characterized in that: The rotating shaft (321) is arranged inside the kettle body (2), and is movably installed between the rotating shaft (321) and the top cover (314). The top end of the rotating shaft (321) passes through the kettle body (2) and the top cover (314) in sequence, and the top end of the rotating shaft (321) extends to the top of the top cover (314). The scraping surface of the scraper (323) contacts the inner wall of the kettle body (2), and the motor (325) is fixedly installed on the top of the top cover (314).

5. The multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium battery according to claim 1, characterized in that: The multi-stage crystallization part (41) comprises a vacuum pump (411), a connecting pipe (412) is fixedly installed at the bottom end of the vacuum pump (411), a connecting end (413) is fixedly installed on the left side of the connecting pipe (412), a barometer (414) is fixedly installed on the left side of the connecting end (413), a pressure valve (415) is arranged on the top of the kettle body (2), and an evaporation device (416) is fixedly installed inside the kettle body (2).

6. The multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium battery according to claim 5, characterized in that: The vacuum pump (411) is arranged on the top of the top cover (314); the vacuum pump (411) and the top cover (314) are fixedly installed via a frame; the bottom end of the connecting pipe (412) passes through the top cover (314) and extends to the inside of the top cover (314); and the air pressure valve (415) is fixedly installed on the top of the top cover (314).

7. The multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium battery according to claim 1, characterized in that: The collecting part (42) comprises a collecting frame (421), a filter screen (422) is arranged on the top of the collecting frame (421), a frame body (423) is arranged on the top of the collecting frame (421), a discharge hopper (424) is fixedly installed on the bottom of the kettle body (2), and a valve (425) is fixedly installed inside the discharge hopper (424).

8. The multi-stage crystallization device for preparing lithium hexafluorophosphate for lithium battery according to claim 7, characterized in that: The collecting frame (421) is arranged at the bottom of the kettle body (2); the collecting frame (421) and the bottom column (1) are movably mounted by snap-fitting; the filter screen (422) is fixedly mounted inside the frame body (423); the frame body (423) and the bottom column (1) are movably mounted by snap-fitting; the discharge hopper (424) is connected to the inside of the kettle body (2); and the filter screen (422) is arranged directly above the collecting frame (421).