Liquid lithium hexafluorophosphate sampling device

Abstract

The utility model discloses a liquid lithium hexafluorophosphate sampling device which comprises a sampling assembly, the top of the sampling assembly is in threaded connection with an extraction mechanism, a pre-sampling treatment assembly is arranged in the extraction mechanism, the sampling assembly comprises a liquid sampling bin, the extraction mechanism comprises a bin cover, the pre-sampling treatment assembly comprises a nitrogen cylinder, and the nitrogen cylinder is in threaded connection with the extraction mechanism. And a first gas outlet pipe is arranged on the surface of the nitrogen cylinder. According to the lithium hexafluorophosphate sampling device, through the arrangement of the pre-sampling treatment assembly, before sampling, air in the liquid sampling bin is completely exhausted in a water injection mode, then nitrogen is introduced into the liquid sampling bin, so that the liquid sampling bin is filled with nitrogen which does not react with lithium hexafluorophosphate at normal temperature, and then the air pressure in the liquid sampling bin is reduced in an air exhaust mode; therefore, sampling is completed, air remaining in the liquid sampling bin is avoided, and a sample detection result is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium hexafluorophosphate sampling, and particularly relates to a sampling device for liquid lithium hexafluorophosphate. Background Art

[0002] Lithium hexafluorophosphate is a key raw material for lithium-ion battery electrolytes. Due to its many excellent properties, such as high energy, low self-discharge, long cycle life, fast charge and discharge, excellent high and low temperature performance, high discharge power, and no memory effect, it has become the preferred high-performance battery raw material and is widely used in the fields of 3C, power batteries, energy storage, etc.

[0003] For example, the Chinese patent with the publication number CN221174037U discloses a lithium hexafluorophosphate sampling device. The lithium hexafluorophosphate sampling device includes a sample cylinder. An inlet pipe for connecting with the sample outlet pipe of a stainless steel cylinder is arranged on the sample cylinder. A sample outlet valve is arranged on the sample outlet pipe. An inlet valve is arranged on the inlet pipe. A threaded sleeve is arranged on the outer wall of the end of the sample outlet pipe. A nut matching with the thread is rotatably installed at the end of the inlet pipe. A valve seat and a valve body for sealing the inlet pipe in cooperation with the valve seat are arranged in the inlet pipe. The valve seat is guidingly installed in the inlet pipe. The valve body is fixedly connected in the inlet pipe. A return spring for driving the valve seat and the valve body to be sealed is arranged in the inlet pipe. A vacuum extraction pipe is arranged on the sample cylinder. A vacuum valve is arranged on the vacuum extraction pipe. Compared with the prior art, this device avoids the influence of air on lithium hexafluorophosphate during the sampling process, improves the accuracy of the lithium hexafluorophosphate sample, and thus improves the detection accuracy of lithium hexafluorophosphate.

[0004] Although the above example can avoid the reaction between air and lithium hexafluorophosphate by means of vacuum extraction, the vacuum extraction method by a blower cannot achieve a complete vacuum. When the sample cylinder is gradually filled with lithium hexafluorophosphate, the remaining air will react with lithium hexafluorophosphate, and the detection result of the lithium hexafluorophosphate sample does not match the actual situation. Summary of the Utility Model

[0005] The utility model provides a sampling device for liquid lithium hexafluorophosphate to solve the problem that the vacuum extraction method by a blower cannot achieve a complete vacuum. When the sample cylinder is gradually filled with lithium hexafluorophosphate, the remaining air will react with lithium hexafluorophosphate, and the detection result of the lithium hexafluorophosphate sample does not match the actual situation.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A liquid lithium hexafluorophosphate sampling device includes a sampling assembly. A pumping mechanism is threadedly connected to the top of the sampling assembly. A pre-sampling processing assembly is arranged inside the pumping mechanism. The sampling assembly includes a liquid sampling chamber. The pumping mechanism includes a chamber cover. The pre-sampling processing assembly includes a nitrogen cylinder. A first air outlet pipe is arranged on the surface of the nitrogen cylinder. A switching valve is arranged inside the first air outlet pipe. A charging pipe with a valve core at one end is fixedly connected to the surface of the nitrogen cylinder. One end of the first air outlet pipe is fixedly connected to an air inlet ring. The inner cavity of the air inlet ring is communicated with the inside of the liquid sampling chamber. The bottom of the inner cavity of the chamber cover is fixedly connected to a water inlet pipe. One side of the bottom of the inner cavity of the chamber cover is fixedly connected to a second air outlet pipe.

[0008] Preferably, the bottom of the air inlet ring is fixedly connected to the bottom of the inner cavity of the chamber cover. One end of the charging pipe extends to the upper surface of the chamber cover. A first solenoid valve is arranged inside the water inlet pipe. A second solenoid valve is arranged inside the second air outlet pipe.

[0009] Preferably, the inside of the water inlet pipe and the second air outlet pipe is communicated with the inside of the liquid sampling chamber. A third solenoid valve is arranged at one end of the water inlet pipe away from the first solenoid valve.

[0010] Preferably, a blower is fixedly connected to one side of the bottom of the inner cavity of the chamber cover. An air extraction pipe is arranged on one side of the inner cavity of the blower.

[0011] Preferably, a sampling valve is arranged inside the air extraction pipe. One end of the air extraction pipe away from the blower is fixedly connected to the bottom of the chamber cover.

[0012] Preferably, the inside of the blower is communicated with the liquid sampling chamber through the air extraction pipe. Control buttons are arranged on the top of the chamber cover.

[0013] Preferably, a valve is arranged at the lower end of the liquid sampling chamber. A transparent observation window is arranged on the surface of the liquid sampling chamber. A heating plate is arranged on the inner wall of the liquid sampling chamber.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] Through the setting of the pre-sampling processing assembly, before sampling, first, by injecting water, the air in the liquid sampling chamber is completely discharged, and then nitrogen is introduced into the liquid sampling chamber, so that the liquid sampling chamber is filled with nitrogen that does not react with lithium hexafluorophosphate at normal temperature. Subsequently, by pumping air, the air pressure in the liquid sampling chamber is reduced to complete the sampling, avoiding the residual air in the liquid sampling chamber and making the sample test results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0017] Figure 2 is the exploded structural schematic diagram of the present utility model;

[0018] Figure 3 is the structural schematic diagram of the extraction mechanism of the present utility model;

[0019] Figure 4 is the bottom-up structural schematic diagram of the extraction mechanism of the present utility model;

[0020] Figure 5 is the structural schematic diagram of the pre-sampling processing component of the present utility model.

[0021] In the figure: 1. Sampling component; 11. Liquid sampling bin; 12. Valve; 13. Observation window; 14. Heating plate; 2. Extraction mechanism; 21. Bin cover; 22. Blower; 23. Exhaust pipe; 24. Sampling valve; 25. Control button; 3. Pre-sampling processing component; 31. Nitrogen cylinder; 32. First air outlet pipe; 33. Opening and closing valve; 34. Intake ring; 35. Filling pipe; 36. Water inlet pipe; 37. First solenoid valve; 38. Second air outlet pipe; 39. Second solenoid valve; 310. Third solenoid valve. Specific embodiments

[0022] The following is a description of the preferred embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not intended to limit the present utility model.

[0023] As Figures 1-5 shown, the present utility model provides a liquid lithium hexafluorophosphate sampling device, which includes a sampling component 1. The top of the sampling component 1 is threadedly connected with an extraction mechanism 2. The inside of the extraction mechanism 2 is provided with a pre-sampling processing component 3. The sampling component 1 includes a liquid sampling bin 11. The extraction mechanism 2 includes a bin cover 21. The pre-sampling processing component 3 includes a nitrogen cylinder 31. The surface of the nitrogen cylinder 31 is provided with a first air outlet pipe 32. The inside of the first air outlet pipe 32 is provided with an opening and closing valve 33. The surface of the nitrogen cylinder 31 is fixedly connected with a filling pipe 35 with a valve core at one end. One end of the first air outlet pipe 32 is fixedly connected with an intake ring 34. The inner cavity of the intake ring 34 is communicated with the inside of the liquid sampling bin 11. The bottom of the inner cavity of the bin cover 21 is fixedly connected with a water inlet pipe 36. One side of the bottom of the inner cavity of the bin cover 21 is fixedly connected with a second air outlet pipe 38. The bottom of the intake ring 34 is fixedly connected with the bottom of the inner cavity of the bin cover 21. One end of the filling pipe 35 extends to the upper surface of the bin cover 21. The inside of the water inlet pipe 36 is provided with a first solenoid valve 37. The inside of the second air outlet pipe 38 is provided with a second solenoid valve 39. The inside of the water inlet pipe 36 and the second air outlet pipe 38 are communicated with the inside of the liquid sampling bin 11. One end of the water inlet pipe 36 away from the first solenoid valve 37 is provided with a third solenoid valve 310;

[0024] Inject water into the liquid sampling chamber 11 through the water inlet pipe 36. During the water injection process, observe the second air outlet pipe 38. When the water in the liquid sampling chamber 11 is full, the water will overflow from the second air outlet pipe 38. Then stop adding water, close the first solenoid valve 37 and the second solenoid valve 39, open the valve 12, and open the opening and closing valve 33, so that the nitrogen in the nitrogen cylinder 31 enters the liquid sampling chamber 11 along the first air outlet pipe 32, discharge the water in the liquid sampling chamber 11, and make the liquid sampling chamber 11 filled with nitrogen. Then open the first solenoid valve 37 and the heating plate 14, continuously inject nitrogen to increase the air pressure in the liquid sampling chamber 11 to prevent air from entering. At the same time, the heating plate 14 heats the inner wall of the liquid sampling chamber 11 to increase the evaporation rate of the water droplets adhering to the inner wall of the liquid sampling chamber 11, and heats the nitrogen. When the nitrogen is discharged along the water inlet pipe 36, it increases the evaporation rate of the water droplets on the inner wall of the water inlet pipe 36. After the device is completely dried, close the valve 12 and the third solenoid valve 310, and close the opening and closing valve 33 to stop injecting nitrogen. Wait for the temperature of the device to drop to room temperature before starting sampling.

[0025] One side of the bottom of the inner cavity of the lid 21 is fixedly connected with a blower 22. One side of the inner cavity of the blower 22 is provided with an air extraction pipe 23. A sampling valve 24 is arranged inside the air extraction pipe 23. The end of the air extraction pipe 23 far away from the blower 22 is fixedly connected with the bottom of the lid 21;

[0026] By placing one end of the water inlet pipe 36 in the liquid lithium hexafluorophosphate sample, starting the blower 22, opening the sampling valve 24, extracting the nitrogen in the liquid sampling chamber 11 by the blower 22, and under the action of air pressure, making the liquid lithium hexafluorophosphate enter the liquid sampling chamber 11 along the water inlet pipe 36 to conduct sampling.

[0027] The inside of the blower 22 is communicated with the liquid sampling chamber 11 through the air extraction pipe 23. A control button 25 is arranged on the top of the lid 21. A valve 12 is arranged at the lower end of the liquid sampling chamber 11. A light-transmitting observation window 13 is arranged on the surface of the liquid sampling chamber 11. A heating plate 14 is arranged on the inner wall of the liquid sampling chamber 11;

[0028] During the sampling process, observe the liquid level of the liquid lithium hexafluorophosphate through the observation window 13. When it reaches the appropriate position, after closing the sampling valve 24, close the blower 22 and the third solenoid valve 310 to prevent air from entering and complete the sampling, so that the liquid lithium hexafluorophosphate does not contact the air throughout the sampling process and keeps the sample pure.

[0029] The working principle of the present utility model:

[0030] When sampling, first inject water into the liquid sampling chamber 11 through the water inlet pipe 36. During the water injection process, observe the second air outlet pipe 38. When the water in the liquid sampling chamber 11 is full, the water will overflow from the second air outlet pipe 38. Then stop adding water, close the first solenoid valve 37 and the second solenoid valve 39, open the valve 12, and open the opening and closing valve 33 so that the nitrogen in the nitrogen cylinder 31 enters the liquid sampling chamber 11 along the first air outlet pipe 32, discharge the water in the liquid sampling chamber 11, and fill the liquid sampling chamber 11 with nitrogen. Then open the first solenoid valve 37 and the heating plate 14, continuously inject nitrogen to increase the air pressure in the liquid sampling chamber 11 to prevent air from entering. At the same time, the heating plate 14 heats the inner wall of the liquid sampling chamber 11 to increase the evaporation rate of the water droplets adhering to the inner wall of the liquid sampling chamber 11, and heats the nitrogen so that when the nitrogen is discharged along the water inlet pipe 36, the evaporation rate of the water droplets on the inner wall of the water inlet pipe 36 is increased. After the device is completely dried, close the valve 12 and the third solenoid valve 310, and close the opening and closing valve 33 to stop injecting nitrogen. After waiting for the temperature of the device to drop to room temperature, place one end of the water inlet pipe 36 into the liquid lithium hexafluorophosphate sample, start the blower 22, open the sampling valve 24, draw out the nitrogen in the liquid sampling chamber 11 through the blower 22, and under the action of air pressure, make the liquid lithium hexafluorophosphate enter the liquid sampling chamber 11 along the water inlet pipe 36 for sampling. During the sampling process, observe the liquid level of the liquid lithium hexafluorophosphate through the observation window 13. When it reaches the appropriate position, after closing the sampling valve 24, close the blower 22 and the third solenoid valve 310 to prevent air from entering, complete the sampling, and ensure that the liquid lithium hexafluorophosphate does not contact the air during the whole sampling process to keep the sample pure.

[0031] The above are only the preferred embodiments of the present invention. Any person skilled in the art may modify the present invention by using the technical solutions described above or modify it into equivalent technical solutions. Therefore, any simple modification or equivalent transformation based on the technical solutions of the present invention falls within the scope of protection required by the present invention.

Claims

1. A liquid lithium hexafluorophosphate sampling device, comprising a sampling assembly (1), characterized in that: The top of the sampling assembly (1) is threadedly connected to an extraction mechanism (2), and a pre-sampling treatment assembly (3) is arranged inside the extraction mechanism (2). The sampling assembly (1) comprises a liquid sampling chamber (11), the extraction mechanism (2) comprises a chamber cover (21), and the pre-sampling treatment assembly (3) comprises a nitrogen bottle (31). A first air outlet pipe (32) is arranged on the surface of the nitrogen bottle (31), and an opening and closing valve (33) is arranged inside the first air outlet pipe (32). An air charging pipe (35) having a valve core arranged at one end is fixedly connected to the surface of the nitrogen bottle (31), an air intake ring (34) is fixedly connected to one end of the first air outlet pipe (32), and an inner cavity of the air intake ring (34) is communicated with the interior of the liquid sampling chamber (11). A water inlet pipe (36) is fixedly connected to the bottom of the inner cavity of the chamber cover (21), and a second air outlet pipe (38) is fixedly connected to one side of the inner cavity bottom of the chamber cover (21).

2. The liquid lithium hexafluorophosphate sampling device according to claim 1, characterized in that: The bottom of the air inlet ring (34) is fixedly connected to the bottom of the inner cavity of the bin cover (21), one end of the air charging tube (35) extends to the upper surface of the bin cover (21), a first solenoid valve (37) is arranged inside the water inlet pipe (36), and a second solenoid valve (39) is arranged inside the second air outlet pipe (38).

3. The liquid lithium hexafluorophosphate sampling device according to claim 2, characterized in that: The interiors of the water inlet pipe (36) and the second air outlet pipe (38) are in communication with the interior of the liquid sampling chamber (11); a third solenoid valve (310) is provided at one end of the water inlet pipe (36) away from the first solenoid valve (37).

4. The liquid lithium hexafluorophosphate sampling device according to claim 1, characterized in that: A blower (22) is fixedly connected to one side of the bottom of the inner cavity of the bin cover (21), and an exhaust pipe (23) is provided on one side of the inner cavity of the blower (22).

5. The liquid lithium hexafluorophosphate sampling device according to claim 4, characterized in that: A sampling valve (24) is arranged inside the air extraction pipe (23), and one end of the air extraction pipe (23) away from the blower (22) is fixedly connected to the bottom of the bin cover (21).

6. The liquid lithium hexafluorophosphate sampling device according to claim 4, characterized in that: The interior of the blower (22) is connected to the liquid sampling chamber (11) via an air extraction pipe (23), and a control button (25) is provided on the top of the chamber cover (21).

7. The liquid lithium hexafluorophosphate sampling device according to claim 1, characterized in that: A valve (12) is provided at the lower end of the liquid sampling chamber (11), a light-transmitting observation window (13) is provided on the surface of the liquid sampling chamber (11), and a heating plate (14) is provided on the inner wall of the liquid sampling chamber (11).

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