Mixing device and preparation system for electrolyte

Abstract

The utility model discloses a mixing device. The mixing device comprises a preparation kettle, a circulating pump, a heat exchanger, a conveyor and a feeding assembly, the circulating pump and the conveyor can be alternately communicated with the preparation kettle and the heat exchanger; by adopting the mixing device, the circulating pump is communicated with the preparation kettle and the heat exchanger, and the original organic solvent in the preparation kettle is cooled through the heat exchanger; then the conveyor is communicated with the preparation kettle and the heat exchanger, the conveyor guides the organic solvent to circularly flow, the feeding assembly conveys the solid lithium salt into the conveyor, the solid lithium salt and the organic solvent are preliminarily mixed, and the mixture is cooled through the heat exchanger and then enters the preparation kettle. The mixed solution is cooled by the heat exchanger and then enters the preparation kettle, so that the temperature of the solution can be effectively prevented from being too high, and the influence of byproducts generated at high temperature on the quality of the electrolyte is avoided. The utility model further discloses a preparation system for the electrolyte.

Description

Technical Field

[0001] The present application belongs to the technical field of electrolyte preparation, and specifically relates to a mixing device and a preparation system for an electrolyte. Background Art

[0002] The current mainstream electrolyte is usually prepared by using high-purity organic solvents, lithium salts and various additives in a certain proportion. Specifically, the raw materials are added to the preparation kettle in order and stirred thoroughly. Commonly used lithium salts include solid lithium hexafluorophosphate, lithium difluorophosphate, lithium difluorooxalatoborate and lithium bis(fluorosulfonyl)imide. When some solid lithium salts are transported to the organic solvent in the preparation kettle for dissolution, intense heat release will occur, resulting in excessively high material temperature in the preparation kettle, and the byproducts produced by high temperature will affect the quality of the electrolyte. Utility Model Content

[0003] The technical problem to be solved by the present application is that the existing lithium salt undergoes violent heat release during dissolution, which causes the material temperature in the preparation kettle to be too high, affecting the quality of the electrolyte. In order to solve the above technical problem, a mixing device and a preparation system for the electrolyte are provided.

[0004] The technical solution proposed in this application is:

[0005] A mixing device, comprising:

[0006] Preparation kettle;

[0007] A circulating pump, the feeding end of which is connected to the discharging end of the preparation kettle;

[0008] A heat exchanger, wherein the feed end is connected to the discharge end of the circulating pump, and the discharge end of the heat exchanger is connected to the feed end of the preparation kettle;

[0009] A conveyor, the feed end of which is connected to the discharge end of the preparation kettle, and the discharge end of the conveyor is connected to the feed end of the heat exchanger;

[0010] A feeding assembly, connected to the conveyor, and used for conveying materials into the conveyor;

[0011] Wherein, the circulation pump and the conveyor can be alternately connected to the preparation kettle and the heat exchanger.

[0012] Furthermore, the feeding assembly includes a feeding bucket and a weighing module, the feeding bucket is carried by the weighing module, and the discharge end of the feeding bucket is connected to the conveyor.

[0013] Furthermore, the feeding assembly also includes a feeding pipe and a feeding valve, the two ends of the feeding pipe are respectively connected to the discharge end of the feeding bucket and the conveyor, and the feeding valve is arranged on the feeding pipe.

[0014] Further, the conveyor includes a conveying cylinder, conveying blades and a driving member. The discharge end of the preparation kettle and the feed end of the heat exchanger are both connected to the conveying cylinder. The conveying blades are arranged inside the conveying cylinder, and the driving member is connected to the conveying blades to drive the conveying blades to rotate. During the rotation of the conveying blades, the materials can be mixed and conveyed to the heat exchanger.

[0015] Further, the conveying cylinder has a first cavity and a second cavity that communicate with each other. The discharge end of the preparation kettle communicates with the first cavity, and the feed end of the heat exchanger communicates with the second cavity. The conveying blades are arranged in the first cavity and are used to guide the materials in the first cavity to be conveyed to the second cavity.

[0016] Further, the flow area of the first cavity is larger than that of the second cavity; the feeding assembly communicates with the second cavity.

[0017] Further, the mixing device further includes a first circulation pipeline, a second circulation pipeline and a third circulation pipeline. The two ends of the first circulation pipeline are respectively connected to the discharge end of the preparation kettle and the feed end of the circulation pump. The two ends of the second circulation pipeline are respectively connected to the discharge end of the circulation pump and the feed end of the heat exchanger. The two ends of the third circulation pipeline are respectively connected to the discharge end of the heat exchanger and the feed end of the preparation kettle;

[0018] The mixing device further includes a first mixing pipeline and a second mixing pipeline. One end of the first mixing pipeline is connected to the first circulation pipeline, and the other end is connected to the feed end of the conveyor; One end of the second mixing pipeline is connected to the discharge end of the conveyor, and the other end is connected to the second circulation pipeline.

[0019] Further, the mixing device further includes a first circulation valve, a second circulation valve, a first mixing valve and a second mixing valve;

[0020] The first circulation valve and the second circulation valve are respectively arranged on the first circulation pipeline and the second circulation pipeline;

[0021] Along the material conveying direction, the first circulation valve is located downstream of the connection between the first mixing pipeline and the first circulation pipeline, and the second circulation valve is located upstream of the connection between the second mixing pipeline and the second circulation pipeline;

[0022] The first mixing valve is arranged on the first mixing pipeline, and the second mixing valve is arranged on the second mixing pipeline.

[0023] Further, the mixing device further includes a discharge pipeline and a discharge valve. One end of the discharge pipeline is connected to the second circulation pipeline. Along the material conveying direction, the discharge pipeline is located downstream of the second mixing pipeline, and the discharge valve is arranged on the discharge pipeline.

[0024] The mixing device further includes a gas supply mechanism and a third circulation valve. The gas supply mechanism is connected to the preparation kettle, and the third circulation valve is arranged on the second circulation pipeline and is located between the discharge pipeline and the heat exchanger.

[0025] A preparation system for electrolyte includes the mixing device as described above.

[0026] By using the above mixing device, first, the circulation pump, the preparation kettle and the heat exchanger are connected. The organic solvent originally in the preparation kettle is cooled by the heat exchanger. Then, the conveyor is connected to the preparation kettle and the heat exchanger. The conveyor guides the organic solvent to circulate. The feeding component conveys the solid lithium salt into the conveyor. The solid lithium salt is preliminarily mixed with the organic solvent. After mixing, it is cooled by the heat exchanger and then enters the preparation kettle. Since the mixed solution enters the preparation kettle after being cooled by the heat exchanger, it can effectively avoid the solution temperature being too high, and further avoid high temperature from generating by-products and affecting the quality of the electrolyte. Description of the Drawings

[0027] The drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0028] Figure 1 It is a schematic diagram of the mixing device provided by an embodiment of the present application.

[0029] Label Description:

[0030] 100, mixing device; 111, preparation kettle; 112, circulation pump; 113, heat exchanger; 114, conveyor; 115, feeding component; 116, feeding pipeline; 117, feeding valve; 118, heat preservation layer; 119, stirring mechanism; 120, first circulation pipeline; 121, second circulation pipeline; 122, third circulation pipeline; 123, first mixing pipeline; 124, second mixing pipeline; 125, first circulation valve; 126, second circulation valve; 127, first mixing valve; 128, second mixing valve; 129, discharge pipeline; 130, discharge valve; 131, gas supply mechanism; 132, third circulation valve; 133, conveying cylinder; 134, driving part; 135, cooling structure; 136, feeding barrel; 137, weighing module; 138, intake pipeline; 139, feeding pipeline; 140, feeding valve; 141, support. Detailed Embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0032] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0033] On the one hand, the present application provides a mixing device for mixing raw materials for preparing an electrolyte.

[0034] As Figure 1 shown, in one embodiment, the mixing device 100 includes a preparation kettle 111, a circulation pump 112, and a heat exchanger 113. The feed end and the discharge end of the circulation pump 112 are respectively connected to the discharge end of the preparation kettle 111 and the feed end of the heat exchanger 113, and the discharge end of the heat exchanger 113 is connected to the feed end of the preparation kettle 111. In this way, the material in the preparation kettle 111 can be circulated in the preparation kettle 111, the circulation pump 112, and the heat exchanger 113 through the circulation pump 112, and the heat exchanger 113 can cool down the material, thereby preventing the temperature of the material in the preparation kettle 111 from being too high.

[0035] Further, the mixing device 100 further includes a conveyor 114 and a feeding assembly 115. The feed end of the conveyor 114 is connected to the discharge end of the preparation kettle 111, and the discharge end of the conveyor 114 is connected to the feed end of the heat exchanger 113; the feeding assembly 115 is connected to the conveyor 114 for feeding materials into the conveyor 114. Among them, the circulation pump 112 and the conveyor 114 can be alternately communicated with the preparation kettle 111 and the heat exchanger 113.

[0036] It should be noted that the material fed into the conveyor 114 by the feeding assembly 115 is a solid lithium salt. The original material in the preparation kettle 111 is an organic solvent.

[0037] It is certain that when the conveyor 114 is connected to the preparation kettle 111 and the heat exchanger 113, the conveyor 114 can also guide the material to circulate in the preparation kettle 111, the conveyor 114 and the heat exchanger 113. At the same time, since the feeding component 115 can convey the solid lithium salt into the conveyor 114, the solid lithium salt can be preliminarily mixed with the organic solvent in the circulating flow in the conveyor 114.

[0038] With the above-mentioned mixing device 100, first connect the circulation pump 112 to the preparation kettle 111 and the heat exchanger 113, and cool down the original organic solvent in the preparation kettle 111 through the heat exchanger 113; then connect the conveyor 114 to the preparation kettle 111 and the heat exchanger 113, the conveyor 114 guides the organic solvent to circulate, the feeding component 115 conveys the solid lithium salt into the conveyor 114, the solid lithium salt is preliminarily mixed with the organic solvent, and after mixing, it is cooled down by the heat exchanger 113 and then enters the preparation kettle 111. Since the mixed solution enters the preparation kettle 111 after being cooled down by the heat exchanger 113, it can effectively avoid the solution temperature being too high, and further avoid the high temperature generating by-products and affecting the quality of the electrolyte.

[0039] In addition, the solid lithium salt is added to the conveyor 114, preliminarily mixed with the circulating organic solvent, and then conveyed back to the preparation kettle 111 for secondary stirring, which can improve the mixing speed. Moreover, during the preliminary mixing process, the solid lithium salt can dissolve and release heat preliminarily, thereby reducing the heat released after entering the preparation kettle 111, further reducing the temperature of the material in the preparation kettle 111, and avoiding the temperature being too high.

[0040] Optionally, the heat exchanger 113 is a spiral tube heat exchanger, and the temperature of the coolant inside the heat exchanger 113 is -5 to -15 °C.

[0041] In one embodiment, the mixing device 100 further includes a feed pipeline 116 and a feed valve 117. The feed pipeline 116 is connected to the preparation kettle 111 and is used to convey the material, that is, the organic solvent, into the preparation kettle 111. The feed valve 117 is arranged on the feed pipeline 116 and is used to control the on-off of the feed pipeline 116.

[0042] In one embodiment, the preparation kettle 111 is provided with a heat preservation layer 118 and a stirring mechanism 119. The heat preservation layer 118 is located outside the preparation kettle 111 and can keep the material in the preparation kettle 111 warm to avoid large temperature fluctuations; the stirring mechanism 119 is used to stir the material to ensure that the material is evenly mixed.

[0043] In one embodiment, the mixing device 100 further includes a first circulation pipeline 120, a second circulation pipeline 121, and a third circulation pipeline 122. Two ends of the first circulation pipeline 120 are respectively connected to the discharge end of the preparation kettle 111 and the feed end of the circulation pump 112. Two ends of the second circulation pipeline 121 are respectively connected to the discharge end of the circulation pump 112 and the feed end of the heat exchanger 113. Two ends of the third circulation pipeline 122 are respectively connected to the discharge end of the heat exchanger 113 and the feed end of the preparation kettle 111.

[0044] It can be understood that the first circulation pipeline 120 is connected to the bottom of the preparation kettle 111, and the feed pipeline 116 and the third circulation pipeline 122 are connected to the top of the preparation kettle 111. In addition, the connection part of the feed pipeline 116 and the preparation kettle 111 can also be understood as the feed end of the preparation kettle 111.

[0045] Furthermore, the mixing device 100 further includes a first mixing pipeline 123 and a second mixing pipeline 124. One end of the first mixing pipeline 123 is connected to the first circulation pipeline 120, and the other end is connected to the feed end of the conveyor 114 to connect the discharge end of the preparation kettle 111 and the feed end of the conveyor 114. One end of the second mixing pipeline 124 is connected to the discharge end of the conveyor 114, and the other end is connected to the second circulation pipeline 121 to connect the discharge end of the conveyor 114 and the feed end of the heat exchanger 113.

[0046] In one embodiment, the mixing device 100 further includes a first circulation valve 125 and a second circulation valve 126. The first circulation valve 125 and the second circulation valve 126 are respectively arranged on the first circulation pipeline 120 and the second circulation pipeline 121. Along the material conveying direction, the first circulation valve 125 is located downstream of the connection part of the first mixing pipeline 123 and the first circulation pipeline 120, and the second circulation valve 126 is located upstream of the connection part of the second mixing pipeline 124 and the second circulation pipeline 121.

[0047] Further, the mixing device 100 further includes a first mixing valve 127 and a second mixing valve 128. The first mixing valve 127 is disposed in the first mixing pipeline 123, and the second mixing valve 128 is disposed in the second mixing pipeline 124. It can be seen therefrom that in this embodiment, the circulation pump 112 and the conveyor 114 are alternately communicated with the preparation kettle 111 and the heat exchanger 113 through the circulation valve and the mixing valve. Specifically, when the circulation valve is opened and the mixing valve is closed, the circulation pump 112 is communicated with the preparation kettle 111 and the heat exchanger 113, and the conveyor 114 is disconnected from the preparation kettle 111 and the heat exchanger 113, and the material circulates along the preparation kettle 111, the circulation pump 112 and the heat exchanger 113; when the circulation valve is closed and the mixing valve is opened, the circulation pump 112 is disconnected from the preparation kettle 111 and the heat exchanger 113, and the conveyor 114 is communicated with the preparation kettle 111 and the heat exchanger 113, and the material circulates along the preparation kettle 111, the conveyor 114 and the heat exchanger 113.

[0048] In other embodiments, the circulation pump 112 and the conveyor 114 can also be communicated with and disconnected from the preparation kettle 111 and the heat exchanger 113 by themselves. In addition, it should be explained that the communication between the circulation pump 112 and the conveyor 114 and the preparation kettle 111 and the heat exchanger 113 means that the material can circulate through the circulation pump 112 or the conveyor 114; similarly, the disconnection means that the material cannot pass through the circulation pump 112 or the conveyor 114. Of course, it is preferably to control the circulation pump 112 and the conveyor 114 to be alternately communicated with the preparation kettle 111 and the heat exchanger 113 through the circulation valve and the mixing valve.

[0049] Optionally, the transfer pump is a canned magnetic pump or a pneumatic diaphragm pump.

[0050] In one embodiment, the mixing device 100 further includes a discharge pipeline 129 and a discharge valve 130. One end of the discharge pipeline 129 is connected to the second circulation pipeline 121, and along the material conveying direction, the discharge pipeline 129 is located downstream of the second mixing pipeline 124 to ensure that the material in the conveyor 114 can also be discharged through the discharge pipeline 129 during discharging. The discharge valve 130 is disposed in the discharge pipeline 129 for controlling the on-off of the discharge pipeline 129.

[0051] Further, the mixing device 100 further includes a gas supply mechanism 131 and a third circulation valve 132. The gas supply mechanism 131 is connected to the preparation kettle 111 for supplying inert gas into the preparation kettle 111 to press the material in the circulation pump 112 and the conveyor 114 into the discharge pipeline 129 during discharging; the third circulation valve 132 is disposed in the second circulation pipeline 121 and is located between the discharge pipeline 129 and the heat exchanger 113.

[0052] For ease of understanding, the operation of the air supply mechanism 131 will be described below by taking the conveyor 114 as an example: When it is necessary to drain all the materials in the preparation kettle 111 and the conveyor 114, the first circulation valve 125, the second circulation valve 126, and the third circulation valve 132 can be closed first, the first mixing valve 127, the second mixing valve 128, and the discharge valve 130 can be opened, and then the air supply mechanism 131 can be started. The air supply mechanism 131 conveys nitrogen into the preparation kettle 111, and the nitrogen presses the materials in the preparation kettle 111 and the conveyor 114 into the discharge pipeline 129 for discharge. Similarly, when it is necessary to drain all the materials in the circulation pump 112, the first circulation valve 125 and the second circulation valve 126 can be opened, and the first mixing valve 127 and the second mixing valve 128 can be closed.

[0053] In one embodiment, the conveyor 114 includes a conveying cylinder 133 and conveying blades. The discharge end of the preparation kettle 111 and the feed end of the heat exchanger 113 are both connected to the conveying cylinder 133. The conveying blades are arranged inside the conveying cylinder 133 and are rotatable. During the rotation of the conveying blades, the materials can be mixed and conveyed to the heat exchanger 113. Optionally, the blades of the conveyor 114 can adopt the same blades as those of the disperser to ensure that during the rotation of the conveying blades, the materials can be sheared and dispersed for mixing and the materials can also be conveyed. Of course, in other embodiments, the conveyor 114 can also be a disperser, and the disperser is provided with a discharge port for conveying the materials to the heat exchanger 113.

[0054] Furthermore, the driving member 134 is connected to the conveying blades to drive the conveying blades to rotate. Specifically, in Figure 1 the illustrated embodiment, the driving member 134 is a motor, and the motor is connected to the conveying blades through a belt and a connecting shaft.

[0055] Even further, the conveyor 114 further includes a cooling structure 135, and the cooling structure 135 is used to cool the mechanical seal structure at the connecting shaft. Specifically, in Figure 1 the illustrated embodiment, the cooling structure 135 includes a liquid inlet pipe and a liquid outlet pipe to realize the circulating flow of the coolant. Among them, the temperature of the coolant in the cooling structure 135 is preferably 0 - 5 °C.

[0056] In one embodiment, the conveying cylinder 133 has a first cavity and a second cavity that communicate with each other. The discharge end of the preparation kettle 111 communicates with the first cavity, and the feed end of the heat exchanger 113 communicates with the second cavity. The conveying blades are arranged in the first cavity and are used to guide the materials in the first cavity to the second cavity, so that the materials are conveyed to the heat exchanger 113 that communicates with the second cavity.

[0057] Specifically, in Figure 1In the illustrated embodiment, the first cavity is located below the second cavity. The first mixing pipe 123 is connected to the side wall of the conveying cylinder 133 and communicates with the first cavity. The second mixing pipe 124 is connected to the top of the conveying cylinder 133 and communicates with the second cavity.

[0058] In one embodiment, the feeding assembly 115 communicates with the second cavity, and the feeding assembly 115 is configured to be operably connected and disconnected from the second cavity. The feeding assembly 115 can convey materials into the second cavity when it is connected to the second cavity. Further, the flow area of the first cavity is larger than the flow area of the second cavity. Thus, according to the Venturi effect, when the materials are conveyed from the first cavity to the second cavity, the flow rate of the materials in the second cavity will increase, thereby forming a negative pressure in the second cavity. At this time, when the feeding assembly 115 is connected to the second cavity, the materials in the feeding assembly 115 are conveyed into the second cavity under the action of the negative pressure.

[0059] In practical applications, the mixing device 100 further includes a pressure detector, which is arranged on the conveying cylinder 133 and used to detect the pressure of the second cavity. When a negative pressure of -0.1 to 0 MPa is formed in the second cavity, the operator can connect the feeding assembly 115 to the second cavity, and the materials in the feeding assembly 115 are conveyed into the second cavity under the action of the negative pressure.

[0060] In one embodiment, the feeding assembly 115 includes a feeding bucket 136 and a weighing module 137. The feeding bucket 136 is carried on the weighing module 137, and the discharging end of the feeding bucket 136 is connected to the conveyor 114 to convey materials into the conveyor 114. The weighing module 137 is used to weigh the feeding bucket 136, so as to accurately control the amount of lithium salt input.

[0061] It should be noted that the feeding bucket 136 needs to be kept sealed when discharging lithium salt. In order to ensure the constant pressure in the feeding bucket 136 and avoid the formation of negative pressure affecting the output of materials, the feeding assembly 115 further includes an air inlet pipe 138 connected to the feeding bucket 136, and the air inlet pipe 138 is used to input nitrogen into the feeding bucket 136.

[0062] Further, the feeding assembly 115 further includes a feeding pipe 139 and a feeding valve 140. The two ends of the feeding pipe 139 are respectively connected to the discharging end of the feeding bucket 136 and the conveyor 114, specifically connected to the conveying cylinder 133 and communicating with the second cavity. The feeding valve 140 is arranged on the feeding pipe 139 to control the on-off of the feeding pipe 139. Thus, the feeding valve 140 can be opened and closed according to the weight of the feeding bucket 136 detected by the weighing module 137 to accurately control the input amount of lithium salt.

[0063] In one embodiment, the feeding assembly 115 further includes a bracket 141 and rollers. The weighing module 137 is disposed on the top of the bracket 141, and the rollers are disposed on the bottom of the bracket 141 to enable the movement of the feeding assembly 115.

[0064] To facilitate the understanding of the technical solution of the present application, the mixing process of the mixing device 100 in the above embodiment is described herein in conjunction with Figure 1 the following:

[0065] First, open the feed valve 117, and input a preset amount of organic solvent into the preparation kettle 111 through the feed pipeline 116. When the amount of the organic solvent reaches 30% of the volume of the preparation kettle 111, start the stirring mechanism 119 to stir. After the input of the organic solvent is completed, open the first circulation valve 125, the second circulation valve 126, and the third circulation valve 132, and at the same time start the circulation pump 112 and the heat exchanger 113. The organic solvent circulates in the preparation kettle 111, the circulation pump 112, and the heat exchanger 113 to cool the organic solvent.

[0066] After the temperature of the organic solvent reaches the preset temperature, close the circulation pump 112, the first circulation valve 125, and the second circulation valve 126, then open the first mixing valve 127 and the second mixing valve 128, and at the same time start the driving member 134. The organic solvent enters the first cavity through the first mixing pipeline 123, and enters the second cavity under the action of the conveying blades, and then enters the heat exchanger 113 and the preparation kettle 111 from the second mixing pipeline 124, so as to realize the circulation of the organic solvent in the preparation kettle 111, the conveyor 114, and the heat exchanger 113.

[0067] When the flow rate of the organic solvent in the second cavity reaches a certain value, a certain negative pressure will be formed in the second cavity. When the pressure detector detects that the negative pressure value reaches -0.1 MPa, open the feeding valve 140, and the lithium salt enters the second cavity through the feeding pipeline 139 to be mixed with the organic solvent. When the feeding amount of the lithium salt reaches the preset requirement, close the feeding valve 140, and keep the driving member 134 operating for a period of time to ensure that the materials are fully mixed to form the electrolyte.

[0068] After detecting the electrolyte and passing the detection, close the driving member 134, the heat exchanger 113, the third circulation valve 132, the first mixing valve 127, and the second mixing valve 128, open the first circulation valve 125, the second circulation valve 126, and the discharge valve 130, start the circulation pump 112 and the gas supply mechanism 131, and pump the electrolyte in the preparation kettle 111 into the discharge pipeline 129 through the circulation pump 112. After the pumping is completed, close the circulation pump 112, the first circulation valve 125, and the second circulation valve 126, open the first mixing valve 127 and the second mixing valve 128, and the gas supply mechanism 131 continues to input nitrogen to press the electrolyte in the conveying cylinder 133 into the discharge pipeline 129 to drain the electrolyte.

[0069] The mixing device 100 in the above embodiments has at least the following advantages:

[0070] 1. It can effectively avoid the overheating of the materials, and prevent the high temperature from generating by-products that affect the quality of the electrolyte;

[0071] 2. The lithium salt and the organic solvent are first preliminarily mixed by the conveyor 114, and then enter the preparation kettle 111 for secondary mixing. By circulating in this way, the mixing speed can be increased;

[0072] 3. The conveying blades can shear and disperse the lithium salt, so that it can be quickly dissolved, further increasing the mixing speed;

[0073] 4. The weighing module 137 and the feeding valve 140 can accurately control the input amount of the lithium salt, thereby ensuring that the components in the electrolyte are qualified.

[0074] In order to prove the above technical effects, the following provides two specific application examples for illustration:

[0075] It should be noted that the following two application examples are simply described, and the specific mixing process can refer to the above description.

[0076] Application Example 1

[0077] Using the mixing device 100 in the above embodiments to prepare 20 t of electrolyte, in which 1.5 t of solid lithium hexafluorophosphate needs to be input. When lithium hexafluorophosphate comes into contact with the organic solvent, it will release a large amount of heat, and the temperature of the materials needs to be controlled below 25 °C.

[0078] First, 18.5 t of the organic solvent is put into the preparation kettle 111, and then the temperature of the organic solvent is controlled at 7 ± 1 °C through the heat exchanger 113. Subsequently, the feeding bucket 136 containing lithium hexafluorophosphate is placed on the weighing module 137, and the pressure in the feeding bucket 136 is relieved to 0.05 - 0.1 MPa; when the pressure in the second cavity reaches -0.1 MPa, the feeding valve 140 is opened to put the lithium hexafluorophosphate into the second cavity. During the feeding process, ensure that the pressure in the feeding bucket 136 is 0.05 ± 0.01 MPa.

[0079] From the start of feeding to the completion of feeding, the production parameters in this process are shown in Table 1:

[0080] Table 1

[0081]

[0082] After the feeding is completed, the driving part 134 continues to operate for 30 min, and then 5 indicators are sampled and detected, namely the moisture, free acid, conductivity, chromaticity, and density of the electrolyte. All 5 indicators are qualified.

[0083] It can be seen that by using the above-mentioned mixing device 100, after the mixed materials are cooled by the heat exchanger 113, the temperature of the materials can be effectively prevented from being too high, thereby avoiding the generation of by-products at high temperature and affecting the quality of the electrolyte.

[0084] Application Example 2

[0085] Using the mixing device 100 in the above embodiment to prepare 5t of electrolyte, 150kg of solid lithium difluorophosphate needs to be put in. Lithium difluorophosphate has low solubility.

[0086] First, 4.85t of organic solvent is put into the preparation kettle 111, and then the temperature of the organic solvent is controlled at 25±1°C through the heat exchanger 113. Subsequently, the feeding bucket 136 containing lithium difluorophosphate is placed on the weighing module 137, and the feeding bucket 136 is depressurized to 0.05~0.1MPa; when the pressure in the second cavity reaches -0.1MPa, the feeding valve 140 is opened to put lithium difluorophosphate into the second cavity. During the feeding process, ensure that the pressure in the feeding bucket 136 is 0.05±0.01MPa.

[0087] From the start of feeding to the completion of feeding, the production parameters in this process are shown in Table 2:

[0088] Table 2

[0089]

[0090] After the feeding is completed, the driving member 134 continues to act, and samples are taken respectively when the driving member 134 continues to act for 30min, 40min, and 50min. Similarly, 5 indicators of the samples are detected, and all the indicator detections are qualified.

[0091] It can be seen that by using the above-mentioned mixing device 100, after the lithium salt with low solubility is sheared and dispersed by the conveying blades, the dissolution rate is greatly increased, thereby accelerating the mixing rate and improving the preparation efficiency of the electrolyte.

[0092] On the other hand, the present application also provides a preparation system for electrolyte, and this preparation system includes the mixing device 100 in the above embodiment. It can be understood that in order to realize the preparation of the electrolyte, this preparation system also includes other devices located upstream and downstream of the mixing device 100. Those skilled in the art can select corresponding devices according to the preparation needs, which will not be elaborated here.

[0093] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A mixing device, characterized in that: include: Preparation kettle; A circulating pump, the feeding end of which is connected to the discharging end of the preparation kettle; A heat exchanger, wherein the feed end is connected to the discharge end of the circulating pump, and the discharge end of the heat exchanger is connected to the feed end of the preparation kettle; A conveyor, the feed end of which is connected to the discharge end of the preparation kettle, and the discharge end of the conveyor is connected to the feed end of the heat exchanger; A feeding assembly, connected to the conveyor, and used for conveying materials into the conveyor; Wherein, the circulation pump and the conveyor can be alternately connected to the preparation kettle and the heat exchanger.

2. The mixing device according to claim 1, characterized in that The feeding assembly includes a feeding bucket and a weighing module. The feeding bucket is carried by the weighing module, and a discharge end of the feeding bucket is connected to the conveyor.

3. The mixing device according to claim 2, characterized in that The feeding assembly also includes a feeding pipeline and a feeding valve. The two ends of the feeding pipeline are respectively connected to the discharge end of the feeding bucket and the conveyor. The feeding valve is arranged on the feeding pipeline.

4. The mixing device according to claim 1, characterized in that The conveyor includes a conveying cylinder, conveying blades and a driving member. The discharge end of the preparation kettle and the feed end of the heat exchanger are both connected to the conveying cylinder. The conveying blades are arranged in the conveying cylinder. The driving member is connected to the conveying blades to drive the conveying blades to rotate. During the rotation of the conveying blades, the materials can be mixed and conveyed to the heat exchanger.

5. The mixing device according to claim 4, characterized in that The conveying cylinder has a first cavity and a second cavity which are interconnected. The discharge end of the preparation kettle is connected to the first cavity, and the feed end of the heat exchanger is connected to the second cavity. The conveying blades are arranged in the first cavity to guide the material in the first cavity to be transported to the second cavity.

6. The mixing device according to claim 5, characterized in that The flow area of ​​the first cavity is greater than the flow area of ​​the second cavity; the feeding assembly is connected to the second cavity.

7. The mixing device according to claim 1, characterized in that The mixing device further comprises a first circulation pipeline, a second circulation pipeline and a third circulation pipeline, the two ends of the first circulation pipeline are respectively connected to the discharge end of the preparation kettle and the feed end of the circulation pump, the two ends of the second circulation pipeline are respectively connected to the discharge end of the circulation pump and the feed end of the heat exchanger, and the two ends of the third circulation pipeline are respectively connected to the discharge end of the heat exchanger and the feed end of the preparation kettle; The mixing device also includes a first mixing pipe and a second mixing pipe, wherein one end of the first mixing pipe is connected to the first circulation pipe, and the other end is connected to the feed end of the conveyor; one end of the second mixing pipe is connected to the discharge end of the conveyor, and the other end is connected to the second circulation pipe.

8. The mixing device according to claim 7, characterized in that The mixing device also includes a first circulation valve, a second circulation valve, a first mixing valve and a second mixing valve; The first circulation valve and the second circulation valve are respectively arranged on the first circulation pipeline and the second circulation pipeline; Along the material conveying direction, the first circulation valve is located downstream of the connection between the first mixing pipeline and the first circulation pipeline, and the second circulation valve is located upstream of the connection between the second mixing pipeline and the second circulation pipeline; The first mixing valve is disposed on the first mixing pipeline, and the second mixing valve is disposed on the second mixing pipeline.

9. The mixing device according to claim 7, characterized in that The mixing device further includes a discharge pipe and a discharge valve, one end of the discharge pipe is connected to the second circulation pipe, along the material conveying direction, the discharge pipe is located downstream of the second mixing pipe, and the discharge valve is arranged on the discharge pipe; The mixing device further comprises an air supply mechanism and a third circulation valve, wherein the air supply mechanism is connected to the preparation kettle, and the third circulation valve is arranged in the second circulation pipeline and is located between the discharge pipeline and the heat exchanger.

10. A system for preparing an electrolyte, characterized in that: A mixing device comprising the mixing device according to any one of claims 1 to 9.

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