A solvent purification column for lithium-ion battery electrolyte production

Abstract

The invention discloses a solvent purification column for lithium ion battery electrolyte production. The invention relates to the technical field of electrolyte production, comprising a purification barrel, wherein the upper side of the purification barrel is fixedly connected with an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe both connect the interior of the purification barrel with the upper exterior of the purification barrel, the upper side of the purification barrel is also fixedly connected with a liquid outlet pipe, the liquid outlet pipe connects the interior of the purification barrel with the upper exterior of the purification barrel, a cooling cavity is opened inside the side wall of the purification barrel, the left side of the outer wall of the purification barrel is fixedly connected with a first cooling pipe and a second cooling pipe due to the right side of the outer wall of the purification barrel, the first cooling pipe and the second cooling pipe both connect the interior of the cooling cavity with the outside of the purification barrel, the invention has the characteristics of strong practicality and preventing the accumulation of high-temperature electrolyte inside the molecular sieve and the broken molecular sieve from reducing the purification efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolyte production, in particular to a solvent purification column for producing lithium ion battery electrolyte. Background Art

[0002] Lithium-ion batteries have the characteristics of high voltage, high specific energy, long cycle life, stable discharge performance, safety and environmental protection. They have very broad application prospects in electric vehicles, energy storage and other fields. Lithium-ion battery electrolyte, as the medium for transmitting lithium ions between the positive and negative electrodes of the battery, has a significant impact on the safety, lifespan and performance of lithium-ion batteries and is known as the "blood" of lithium-ion batteries. The electrolyte is extremely sensitive to moisture. Trace amounts of moisture will react with the lithium hexafluorophosphate in the electrolyte. The use of electrolytes with excessive moisture in production will have a serious impact on battery performance. In order to ensure that the prepared lithium-ion battery has good performance, the moisture content in the battery electrolyte must be strictly controlled during the production process.

[0003] Molecular sieves have a uniform microporous structure with uniform pore diameters. These pores can adsorb molecules smaller than their diameters into the interior of the pores and have a preferential adsorption capacity for polar molecules and unsaturated molecules. Currently, purification columns filled with molecular sieves are generally used in electrolyte production to purify raw solvents. When using purification columns to purify solvents, the molecular sieves in the purification columns need to be replaced at regular intervals. In addition to the fact that the molecular sieves themselves adsorb moisture and impurities and their adsorption capacity decreases, another reason for this problem is that the molecular sieves are crushed and settled after being impacted by the solvent for a long time. In addition, when the purification column continuously purifies the solvent for a long time, the temperature of the purification column will rise rapidly, and the purity of carbonate solvents will gradually decrease as the temperature rises.

[0004] Therefore, it is necessary to design a solvent purification column for lithium-ion battery electrolyte production that is highly practical and prevents the accumulation of high-temperature electrolyte inside the molecular sieve and the reduction of purification efficiency caused by broken molecular sieves. Summary of the Invention

[0005] The object of the present invention is to provide a solvent purification column for lithium ion battery electrolyte production to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a solvent purification column for lithium ion battery electrolyte production, comprising a purification barrel, wherein an air inlet pipe and an air outlet pipe are fixedly connected to the upper side of the purification barrel, respectively, the air inlet pipe and the air outlet pipe both connect the interior of the purification barrel with the upper exterior of the purification barrel, the upper side of the purification barrel is also fixedly connected to a liquid outlet pipe, the liquid outlet pipe connects the interior of the purification barrel with the upper exterior of the purification barrel, a cooling cavity is opened inside the side wall of the purification barrel, a first cooling pipe and a second cooling pipe are fixedly connected to the left side of the outer wall of the purification barrel due to the right side of the outer wall of the purification barrel, the first cooling pipe and the second cooling pipe both connect the interior of the cooling cavity with the outer side of the purification barrel, a fixing ring is fixedly connected to the inner wall of the purification barrel, a fixing frame is placed on the upper side of the fixing ring, a filter is fixedly connected to the inner side wall of the fixing frame, the outer wall of the fixing frame is in contact with the inner wall of the purification barrel, and a cooling mechanism is further provided inside the purification barrel;

[0007] The cooling mechanism includes a transmission assembly and a rotating rod and threaded blades on the transmission assembly. The rotating rod is located in the middle of the filter screen. The outer wall of the rotating rod is rotatably connected to the inner wall of the filter screen through a bearing. The outer wall of the rotating rod is fixedly connected to the outer wall of the threaded blade, and the rotating rod can rotate.

[0008] According to the above technical solution, the transmission assembly includes a bracket, the outer wall of the bracket is fixedly connected to the upper side of the outer wall of the purification barrel, the inner wall of the bracket is fixedly connected to a motor, the lower output end of the motor passes through the purification barrel and extends to the upper inner side of the purification barrel, the lower side of the output end of the motor is fixedly connected to a transmission rod, the lower end of the transmission rod is inserted into the upper inner side of the rotating rod, the lower end of the transmission rod is a hexagonal prism structure, and a chip removal mechanism is provided on the lower side of the rotating rod.

[0009] According to the above technical solution, three filter screens are provided on the outer wall of the rotating rod, and the three filter screens are evenly arranged vertically. There are three threaded blades, and the three threaded blades are respectively provided on the upper sides of the three filter screens.

[0010] According to the above technical solution, the chip removal mechanism includes an insertion rod, a slot is provided on the lower surface of the insertion rod, the upper end of the insertion rod is inserted into the slot, the side wall of the fixing ring is fixedly connected with a connecting piece, one end of the connecting piece is fixedly connected with a fixing seat, the upper surface of the fixing seat is fixedly connected with a first tooth block, the lower end of the rotating rod is located on the upper side of the first tooth block, and the lower end of the rotating rod is fixedly connected with the second tooth block.

[0011] According to the above technical solution, a downward protrusion is provided on the lower side of the second tooth block, and an upward protrusion is provided on the upper side of the first tooth block. The protrusion on the lower side of the second tooth block and the protrusion on the upper side of the first tooth block are arranged alternately.

[0012] According to the above technical solution, three pairs of circular holes are provided on the side wall of the connecting cavity, the upper circular hole is located on the upper side of the middle part of the connecting cavity, the middle and lower circular holes are respectively located on the upper side of the two filters, and a first one-way valve is fixedly connected to the inner wall of the upper circular hole, and the output end of the first one-way valve is located inside the connecting cavity. A second one-way valve is fixedly connected to the inner wall of the lower circular hole, and the output end of the second one-way valve is located on the outside of the rotating rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the present invention, by providing the purification barrel, the cooling cavity, the first cooling pipe and other structures, can prevent the purification barrel from generating high temperature when the electrolyte is processed inside the purification barrel;

[0014] By providing a cooling mechanism, the device can turn over the molecular sieve, so that the molecular sieve can dissipate heat evenly during operation to prevent high temperature;

[0015] By providing a chip removal mechanism, the device can discharge the high-temperature electrolyte inside the molecular sieve during electrolyte purification, preventing the accumulation of high-temperature electrolyte inside the molecular sieve and the broken molecular sieve from reducing the purification efficiency;

[0016] By providing the connecting cavity, the first one-way valve and the second one-way valve, the device can clean the surface of the molecular sieve and prevent excessive broken pieces from adhering to the surface of the molecular sieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0020] Figure 3 Schematic diagram of the internal structure of the fixing frame of the present invention;

[0021] Figure 4 Schematic diagram of the lower structure of the filter screen of the present invention;

[0022] Figure 5 Schematic diagram of the internal structure of the rotating rod of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the second gear block of the present invention;

[0024] In the figure: purification barrel, 2 air inlet pipe, 3 air outlet pipe, 4 liquid inlet pipe, 5 liquid outlet pipe, 6 first cooling pipe, 7 cooling chamber, 8 second cooling pipe, 9 fixing ring, 10 fixing frame, 11 filter screen, 12 cooling mechanism, 201 bracket, 202 motor, 203 transmission rod, 204 rotating rod, 205 threaded blade, 206 chip removal mechanism, 601 plug rod, 602 connecting piece, 603 fixing seat, 604 first gear block, 605 second gear block, 606 connecting chamber, 607 first one-way valve, 608 second one-way valve. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-6 The present invention provides a technical solution: a solvent purification column for the production of lithium-ion battery electrolyte, comprising a purification barrel 1, an air inlet pipe 2 and an air outlet pipe 3 are fixedly connected to the upper side of the purification barrel 1, the air inlet pipe 2 and the air outlet pipe 3 both connect the interior of the purification barrel 1 with the upper exterior of the purification barrel 1, the upper side of the purification barrel 1 is also fixedly connected with a liquid outlet pipe 5, the liquid outlet pipe 5 connects the interior of the purification barrel 1 with the upper exterior of the purification barrel 1, a cooling cavity 7 is opened inside the side wall of the purification barrel 1, the left side of the outer wall of the purification barrel 1 is fixedly connected to a first cooling pipe 6 and a second cooling pipe 8 on the right side of the outer wall of the purification barrel 1, the first cooling pipe 6 and the second cooling pipe 8 both cool The interior of the cavity 7 is connected to the outside of the purification barrel 1. The inner wall of the purification barrel 1 is fixedly connected to a fixing ring 9. A fixing frame 10 is placed on the upper side of the fixing ring 9. The inner wall of the fixing frame 10 is fixedly connected to a filter 11. The outer wall of the fixing frame 10 contacts the inner wall of the purification barrel 1. A cooling mechanism 12 is also provided inside the purification barrel 1. The cooling mechanism 12 includes a transmission assembly and a rotating rod 204 and a threaded blade 205 on the transmission assembly. The rotating rod 204 is located in the middle of the filter 11. The outer wall of the rotating rod 204 is rotatably connected to the inner wall of the filter 11 through a bearing. The outer wall of the rotating rod 204 is fixedly connected to the outer wall of the threaded blade 205, and the rotating rod 204 can rotate.

[0027] During use, the molecular sieve is distributed on the upper surface of the filter 11, and the upper end of the air inlet pipe 2 is connected to the output end of the air supply device, and the upper end of the air outlet pipe 3 is connected to the air pump to replace the gas inside the purification barrel 1. The electrolyte is input into the interior of the purification barrel 1 through the liquid inlet pipe 4, and then the electrolyte passes through the molecular sieve and is discharged from the liquid outlet pipe 5. While the molecular sieve is treating the electrolyte, the coolant is input from the first cooling pipe 6, and the coolant is discharged from the second cooling pipe 8 after passing through the cooling cavity 7, thereby achieving the purpose of cooling the interior of the purification barrel 1 and preventing the molecular sieve from breaking at high temperature.

[0028] The transmission assembly includes a bracket 201, the outer wall of the bracket 201 is fixedly connected to the upper side of the outer wall of the purification barrel 1, the inner wall of the bracket 201 is fixedly connected to the motor 202, the lower output end of the motor 202 passes through the purification barrel 1 and extends to the upper side of the interior of the purification barrel 1, the lower side of the output end of the motor 202 is fixedly connected to the transmission rod 203, the lower end of the transmission rod 203 is inserted into the upper side of the interior of the rotating rod 204, the lower end of the transmission rod 203 is a hexagonal prism structure, and the lower side of the rotating rod 204 is provided with a chip removal mechanism 206, the outer wall of the rotating rod 204 is provided with three filter screens 11, the three filter screens 11 are evenly arranged vertically, and three threaded blades 205 are provided, and the three threaded blades 205 are respectively provided on the upper side of the upper surface of the three filter screens 11;

[0029] While the molecular sieve is working, the motor 202 is started so that the motor 202 drives the transmission rod 203 to rotate, so that the transmission rod 203 drives the rotating rod 204 to rotate, so that the rotating rod 204 drives the threaded blade 205 to rotate, so that the threaded blade 205 flips the higher temperature part of the middle part of the molecular sieve accumulated on the upper surface of the filter screen 11 upward, so that the molecular sieve is evenly cooled and the upper and lower layers of the molecular sieve are constantly changed to ensure its working effect.

[0030] The chip removal mechanism 206 includes an insert rod 601, a slot is provided on the lower surface of the insert rod 601, the upper end of the insert rod 601 is inserted into the slot, the side wall of the fixing ring 9 is fixedly connected with a connecting piece 602, one end of the connecting piece 602 is fixedly connected with a fixing seat 603, the upper surface of the fixing seat 603 is fixedly connected with a first tooth block 604, the lower end of the rotating rod 204 is located on the upper side of the first tooth block 604, the lower end of the rotating rod 204 is fixedly connected with a second tooth block 605, the lower side of the second tooth block 605 is provided with a downward protrusion, and the upper side of the first tooth block 604 is provided with The upward protrusion, the protrusion on the lower side of the second tooth block 605 and the protrusion on the upper side of the first tooth block 604 are arranged in an interlaced manner, and three pairs of circular holes are opened on the side wall of the connecting chamber 606. The upper circular hole is located on the upper side of the middle part of the connecting chamber 606, and the middle and lower circular holes are respectively located on the upper sides of the two filter screens 11. The inner wall of the upper circular hole is fixedly connected to the first one-way valve 607, and the output end of the first one-way valve 607 is located inside the connecting chamber 606. The inner wall of the lower circular hole is fixedly connected to the second one-way valve 608, and the output end of the second one-way valve 608 is located on the outside of the rotating rod 204;

[0031] When the rotating rod 204 rotates, the rotating rod 204 drives the second tooth block 605 to rotate. Since the lower side of the second tooth block 605 is blocked by the first tooth block 604, the second tooth block 605 will rise while rotating, causing the second tooth block 605 to move upward, and at the same time drive the rotating rod 204, the filter screen 11, and the fixing frame 10 to move upward, so that the filter screen 11 rises. As the second tooth block 605 rotates, the protrusion on the lower side of the second tooth block 605 moves to the recessed position of the first tooth block 604, causing the second tooth block 605, the rotating rod 204, and the filter screen 11 to descend along with the molecular sieve. At the same time, the up and down movement of the filter screen 11 discharges the high-temperature electrolyte inside the molecular sieve, and causes the broken parts inside the molecular sieve to fall to the bottom of the molecular sieve, preventing the broken molecular sieve from hindering the working effect of the complete molecular sieve.

[0032] And when the connecting chamber 606 moves downward, the transmission rod 203 is pulled out a part toward the outside of the connecting chamber 606, which will cause the interior of the connecting chamber 606 to extract the treated electrolyte through the first one-way valve 607. When the connecting chamber 606 moves upward, as the transmission rod 203 is inserted into the internal space of the connecting chamber 606, the electrolyte inside the connecting chamber 606 will be quickly sprayed out through the second one-way valve 608 to the interior of the molecular sieve on the upper surface of the filter 11, so that the adhesion on the surface of the molecular sieve is removed, so that it can work efficiently.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A solvent purification column for lithium-ion battery electrolyte production, comprising a purification barrel (1), wherein an air inlet pipe (2) and an air outlet pipe (3) are fixedly connected to the upper side of the purification barrel (1), characterized in that: The air inlet pipe (2) and the air outlet pipe (3) are both connected to the interior of the purification barrel (1) and the exterior of the upper side of the purification barrel (1). The upper side of the purification barrel (1) is also fixedly connected to a liquid outlet pipe (5). The liquid outlet pipe (5) connects the interior of the purification barrel (1) and the exterior of the upper side of the purification barrel (1). A cooling cavity (7) is provided inside the side wall of the purification barrel (1). The left side of the outer wall of the purification barrel (1) and the right side of the outer wall of the purification barrel (1) are respectively fixedly connected to a first cooling pipe (6) and a second cooling pipe (8). The first cooling pipe (7) is connected to the left side of the outer wall of the purification barrel (1). The cooling tube (6) and the second cooling tube (8) are both arranged to connect the interior of the cooling chamber (7) with the outside of the purification barrel (1); the inner wall of the purification barrel (1) is fixedly connected with a fixing ring (9); a fixing frame (10) is placed on the upper side of the fixing ring (9); the inner wall of the fixing frame (10) is fixedly connected with a filter (11); when in use, the molecular sieve is distributed on the upper surface of the filter (11); the outer wall of the fixing frame (10) contacts the inner wall of the purification barrel (1); and a cooling mechanism (12) is also provided inside the purification barrel (1); The cooling mechanism (12) comprises a transmission assembly and a rotating rod (204) and a threaded blade (205) on the transmission assembly. The rotating rod (204) is located in the middle of the filter screen (11). The outer wall of the rotating rod (204) is rotatably connected to the inner wall of the filter screen (11) via a bearing. The outer wall of the rotating rod (204) is fixedly connected to the outer wall of the threaded blade (205). The rotating rod (204) is rotatable. The transmission assembly comprises a motor (202), a transmission rod (203) is fixedly connected to the lower side of the output end of the motor (202), the lower end of the transmission rod (203) is plugged into the upper side of the inner portion of the rotating rod (204), the lower end of the transmission rod (203) is a hexagonal prism structure, and a chip removal mechanism (206) is provided on the lower side of the rotating rod (204). When the molecular sieve is working, the motor (202) is started to drive the transmission rod (203) to rotate, so that the transmission rod (203) drives the rotating rod (204) to rotate; The side wall of the fixing ring (9) is fixedly connected to a connecting piece (602), one end of the connecting piece (602) is fixedly connected to a fixing seat (603), the upper surface of the fixing seat (603) is fixedly connected to a first tooth block (604), the lower end of the rotating rod (204) is located on the upper side of the first tooth block (604), and the lower end of the rotating rod (204) is fixedly connected to a second tooth block (605); The lower side of the second tooth block (605) is provided with a downward protrusion, and the upper side of the first tooth block (604) is provided with an upward protrusion, and the protrusion on the lower side of the second tooth block (605) and the protrusion on the upper side of the first tooth block (604) are arranged in a staggered manner; The side wall of the connecting chamber (606) is provided with three pairs of circular holes, wherein the upper circular hole is located on the upper side of the middle portion of the connecting chamber (606), and the middle and lower circular holes are respectively located on the upper sides of the two filter screens (11). A first one-way valve (607) is fixedly connected to the inner wall of the upper circular hole, and the output end of the first one-way valve (607) is located inside the connecting chamber (606). A second one-way valve (608) is fixedly connected to the inner wall of the lower circular hole, and the output end of the second one-way valve (608) is located outside the rotating rod (204).

2. The solvent purification column for lithium-ion battery electrolyte production according to claim 1, characterized in that: The outer wall of the rotating rod (204) is provided with three filter screens (11), and the three filter screens (11) are evenly arranged vertically. The number of the threaded blades (205) is three, and the three threaded blades (205) are respectively provided on the upper sides of the three filter screens (11).

3. The solvent purification column for lithium-ion battery electrolyte production according to claim 1, characterized in that: The transmission assembly comprises a bracket (201), the outer wall of the bracket (201) is fixedly connected to the upper side of the outer wall of the purification barrel (1), the inner wall of the bracket (201) is fixedly connected to a motor (202), and the lower output end of the motor (202) passes through the purification barrel (1) and extends to the upper side of the interior of the purification barrel (1).

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