Sulfonimide lithium liquid salt dryer

Abstract

The utility model discloses a bis (fluorosulfonyl) imide lithium liquid salt dryer, which comprises a cylinder, an upper seal head and a lower seal head, the upper seal head and the lower seal head are respectively arranged at the top and the bottom of the cylinder, an upper baffle and a lower baffle are arranged in the cylinder, a drying agent feed port and a drying agent discharge port are arranged on the side edge of the cylinder, the lower seal head is provided with a liquid salt inlet valve, and the liquid salt inlet valve is provided with a liquid salt outlet valve. And the upper sealing head is provided with a liquid salt outlet valve. According to the dryer, lithium bis (fluorosulfonyl) imide liquid salt containing moisture enters the barrel through the liquid salt inlet of the lower end socket, flows out from the liquid salt outlet valve of the upper end socket through the drying agent, and is circulated for multiple times until the moisture is qualified. And after the moisture is qualified, inert gas is introduced to press the residual imidodisulfuryl fluoride lithium liquid salt in the barrel back to the liquid storage tank.

Description

Technical Field

[0001] The utility model belongs to the field of drying lithium bis(fluorosulfonyl)imide liquid salt, and particularly relates to a drying device for lithium bis(fluorosulfonyl)imide liquid salt. Background Art

[0002] In recent years, China's new energy industry has developed rapidly. In particular, the new energy vehicle industry represented by power battery-type lithium-ion batteries has developed rapidly, so that the application range of power lithium-ion batteries has been continuously expanded. Lithium-ion battery technology has also been continuously progressing. Lithium bis(fluorosulfonyl)imide is an electrolyte additive in lithium battery electrolytes, which can effectively improve the battery performance. Compared with lithium hexafluorophosphate, it is more stable, the battery has better performance at low temperature, and the safety has been greatly improved. At the same time, it has a great improvement in increasing the cruising range and cycle charging times of power batteries. Dichlorosulfonylimide acid, as an important intermediate for preparing lithium bis(fluorosulfonyl)imide, needs to be quickly dried to remove moisture during large-scale industrial production. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a drying device for lithium bis(fluorosulfonyl)imide liquid salt to solve the problems of quickly and efficiently drying and removing moisture during industrial production and quickly and efficiently regenerating the desiccant after it absorbs water.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A drying device for lithium bis(fluorosulfonyl)imide liquid salt includes a cylinder body, an upper head and a lower head. The upper head and the lower head are respectively installed at the top and bottom of the cylinder body. An upper baffle and a lower baffle are arranged in the cylinder body. A desiccant inlet and a desiccant outlet are arranged on the side of the cylinder body. A liquid salt inlet valve is arranged on the lower head, and a liquid salt outlet valve is arranged on the upper head.

[0006] The desiccant enters the cylinder body through the desiccant inlet and is placed on the lower baffle. The upper baffle and the lower baffle are provided with liquid-permeable holes. The lithium bis(fluorosulfonyl)imide liquid salt enters the cylinder body from the liquid salt inlet valve at the bottom and makes full contact with the desiccant. After the moisture in the lithium bis(fluorosulfonyl)imide liquid salt is absorbed by the desiccant, it flows through the liquid salt outlet valve to a liquid storage tank connected to the desiccant.

[0007] Further, a gas pressure balance valve and a pressure gauge are arranged on the upper head.

[0008] The pressure gauge monitors the pressure in the cylinder body in real time, and the gas pressure balance valve can be opened when the pressure is too high.

[0009] Further, an inert gas inlet valve is arranged on the upper head, an inert gas outlet valve is arranged on the lower head, and a liquid salt reflux valve is arranged on the lower head.

[0010] After drying is completed, inert gas enters the cylinder body through the inert gas inlet valve. The liquid salt reflux valve is opened. The inert gas inlet valve is connected to an air pump, which is turned on to press the inert gas into the cylinder body. The residual lithium bis(fluorosulfonyl)imide liquid salt in the cylinder body flows into the liquid storage tank through the liquid salt outlet valve.

[0011] Furthermore, an electric heating wire is wound around the outer wall of the cylinder body.

[0012] The electric heating wire heats the cylinder body, and at the same time, the pressure and flow rate of the inert gas are controlled to regenerate the desiccant.

[0013] Furthermore, the cylinder body is provided with hanging ears.

[0014] The hanging ears are used to fix the position of the cylinder body.

[0015] Furthermore, the cylinder body is provided with an inserted thermometer.

[0016] The inserted thermometer is used to monitor the temperature of the cylinder body.

[0017] Furthermore, a sampling port valve is provided on the liquid salt outlet valve.

[0018] Sampling is taken from the sampling port valve to measure whether the sample reaches the qualified moisture removal level.

[0019] Due to the adoption of the above technical solution, the present utility model has the following beneficial effects:

[0020] The dryer allows the lithium bis(fluorosulfonyl)imide liquid salt containing moisture to enter the cylinder body through the liquid salt inlet of the lower head, pass through the desiccant, and flow out through the liquid salt outlet valve of the upper head. After the moisture is qualified, inert gas is introduced to press the residual lithium bis(fluorosulfonyl)imide liquid salt in the cylinder body back into the liquid storage tank.

[0021] Inert gas is introduced into the cylinder body, and the heating wire outside the dryer cylinder body is used to increase the temperature through heating to regenerate the dryer. After the regeneration is completed, the drying of the next batch of lithium bis(fluorosulfonyl)imide liquid salt is carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only the embodiments recorded in the present utility model.

[0023] Figure 1 It is a front view structural schematic diagram provided for an embodiment of a lithium bis(fluorosulfonyl)imide liquid salt dryer.

[0024] Figure 2 It is a structural schematic diagram of the upper head.

[0025] Figure 3 It is a structural schematic diagram of the lower head.

[0026] Figure 4 It is a schematic structural diagram of the upper baffle plate.

[0027] Explanation of the reference numerals in the drawings:

[0028] 1 Cylinder body, 2 Upper head, 3 Lower head, 4 Upper baffle plate, 5 Lower baffle plate, 6 Liquid salt outlet valve, 7 Inert gas inlet valve, 8 Gas pressure balance valve, 9 Pressure gauge, 10 Liquid salt inlet valve, 11 Liquid salt reflux valve, 12 Inert gas outlet valve, 13 Desiccant feed port, 14 Desiccant discharge port, 15 Electric heating wire, 16 Hanging ear, 17 Thermometer, 18 Sampling port valve. Specific implementation mode

[0029] As Figure 1 shown, a lithium bis(fluorosulfonyl)imide liquid salt dryer includes a cylinder body. An upper head 2 is fixed at the top of the cylinder body 1 as Figure 2 shown, and a lower head 3 is fixed at the bottom of the cylinder body 1 as Figure 3 shown. An upper baffle plate 4 and a lower baffle plate 5 that can permeate liquid are installed in the upper part of the cylinder body 1, and the structures of the upper baffle plate 4 and the lower baffle plate 5 are the same as Figure 4 shown.

[0030] The upper head 2 is provided with a liquid salt outlet valve 6, an inert gas inlet valve 7, a gas pressure balance valve 8 and a pressure gauge 9. A sampling port valve 18 is provided at the liquid salt outlet valve 6. The upper part of the cylinder body 1 is provided with a desiccant feed port 13, a thermometer 17, a hanging ear 16 and a desiccant discharge port 14. An electric heating wire 15 is wound around the outer wall of the cylinder body 1. The lower head 3 is provided with a liquid salt inlet valve 10, a liquid salt reflux valve 11 and an inert gas outlet valve 12. The liquid salt outlet valve 6 is connected to an external liquid storage tank (not shown in the figure), and the inert gas inlet valve is connected to an air pump (not shown in the figure).

[0031] When drying the lithium bis(fluorosulfonyl)imide liquid salt, the dryer is fixed through the hanging ear 16, and the processed desiccant is added through the desiccant feed port 13, and the desiccant feed port 13 is closed.

[0032] The lithium bis(fluorosulfonyl)imide liquid salt containing trace moisture enters the cylinder body 1 through the liquid salt inlet valve 10, enters the dryer cylinder body 1 through the liquid permeating holes on the lower baffle plate 5, the liquid salt makes full contact with the desiccant, the moisture is absorbed by the desiccant, and it flows back to the liquid storage tank by controlling the liquid salt outlet valve 6, and the liquid salt outlet valve 6 is controlled to

[0033] control the flow rate of the liquid salt, and the pressure in the cylinder body 1 is controlled by controlling the gas pressure balance valve 8. The lithium bis(fluorosulfonyl)imide liquid salt

[0034] is sampled through the sampling port valve 18.

[0035] After drying is completed, close the liquid salt inlet valve 10 and the liquid salt outlet valve 6, open the inert gas inlet valve 7 and the liquid salt reflux valve 11, start the air pump, and press the residual lithium bis(fluorosulfonyl)imide liquid salt in the cylinder 1 back to the liquid storage tank through the inert gas.

[0036] Close the liquid salt reflux valve 11, open the inert gas outlet 12, heat the cylinder 1 with the heating wire 15, and control the temperature. Control the pressure and flow rate of the inert gas to remove the moisture in the desiccant and regenerate the desiccant.

[0037] After regeneration, the next batch of repetitive production operations can be carried out.

[0038] After the use effect of the desiccant decreases, the waste desiccant can be removed from the cylinder 1 through the desiccant discharge port 14 and replaced with a new desiccant.

[0039] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A sulfonyl imide lithium salt dryer, characterized in that: It includes a cylinder, an upper head and a lower head, the upper head and the lower head are respectively installed on the top and the bottom of the cylinder, an upper baffle and a lower baffle are arranged in the cylinder, a desiccant feed port and a desiccant discharge port are arranged on the side of the cylinder, the lower head is provided with a liquid salt inlet valve, the upper head is provided with a liquid salt outlet valve, the upper head is provided with an inert gas inlet valve, the lower head is provided with an inert gas outlet valve, and the lower head is provided with a liquid salt reflux valve.

2. The lithium sulfonyl imide liquid salt dryer according to claim 1, characterized in that: The upper sealing head is provided with a gas pressure balancing valve and a pressure gauge.

3. The lithium sulfonyl imide liquid salt dryer according to claim 1, characterized in that: The outer wall of the cylinder is wound with a heating wire.

4. The lithium sulfonyl imide liquid salt dryer according to claim 1, characterized in that: The cylinder is provided with a hanging ear.

5. The lithium sulfonyl imide liquid salt dryer according to claim 1, characterized in that: The cylinder is provided with an insertion thermometer.

6. The lithium sulfonyl imide liquid salt dryer according to claim 1, characterized in that: The liquid salt outlet valve is provided with a sampling port valve.

Images