Electrolyte production device and production method

Abstract

The invention discloses an electrolyte production device and method, and relates to the technical field of electrolytes.The electrolyte production device comprises a premixing tank, a stirring mechanism is arranged in the premixing tank, and the premixing tank is used for material mixing and internal circulation stirring; the liquid solvent conveying unit is used for feeding through a tank car on one side, so that accurate feeding of multiple groups of liquid is realized; the circulation control unit comprises a first pump, a second pump, a first automatic regulating valve, a second automatic regulating valve, an automatic stop valve and an automatic switching valve, and internal circulation and external circulation are formed; the premixing tank, the first pump, the second automatic regulating valve and the premixing tank form internal circulation to be matched with the stirring mechanism, the synergistic effect of forced convection and shear stirring is formed, the dissolving time of a molten solvent and solid lithium salt is shortened, the effect is improved compared with pure stirring, the mixing uniformity is higher, bidirectional solution interaction between the premixing tank and the circulating tank car is achieved through external circulation, and the mixing efficiency is improved. Liquid level regulation and control and cooling functions are considered, and the problems of uneven mixing and slow cooling of single circulation are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolyte, in particular to an electrolyte production device and a production method. BACKGROUND

[0002] As the "blood" of lithium ion batteries, the purity, component ratio and uniformity of electrolyte directly determine the charge-discharge performance, cycle life and safety stability of the battery. Electrolyte production is a complex process of multiple material collaborative reaction, which needs to complete the processes of liquid solvent mixing, molten solvent dissolving, solid lithium salt adding, multi-component deep mixing and tanking in sequence, and has strict requirements on material adding precision, temperature stability, mixing uniformity and production continuity.

[0003] Currently, the industrial production of electrolyte mostly adopts a single-tank stirring and manual assistance mode: liquid solvent is transported through a single pump and a single valve, and the amount of material is controlled by manual observation of the flow meter or liquid level meter; the dissolution of molten solvent and solid lithium salt only relies on the stirring paddle in the tank, and the mixing efficiency is low and local overheating is prone to occur; the temperature and liquid level are controlled separately during the addition of solid lithium salt, and the incomplete dissolution of lithium salt often occurs due to temperature overrun; the material circulation path is single, and undissolved particles are prone to block the pipeline of the tank car; the residual material in the premixing tank after tanking is difficult to remove, leading to batch cross-contamination. The existing device mostly uses a single stirring paddle in the premixing tank for material mixing, lacks forced circulation power, and relies on natural diffusion for the dissolution of molten solvent and solid lithium salt, which is slow and has poor mixing uniformity, resulting in insufficient consistency of electrolyte components and affecting the stability of battery performance. SUMMARY

[0004] The present application aims to provide an electrolyte production device and a production method to solve the problems in the background.

[0005] The purpose of the present application can be achieved by the following technical solutions: An electrolyte production device, comprising a premixing tank, a built-in stirring mechanism for material mixing and internal circulation stirring; A liquid solvent conveying unit, which realizes precise addition of multiple liquids through the tank car on one side for feeding; A circulation control unit, which comprises pump one, pump two, automatic adjusting valve one, automatic adjusting valve two, automatic shut-off valve and automatic on-off valve, forming internal circulation and external circulation; The internal circulation passes through the premixing tank, pump one, automatic adjusting valve two and the premixing tank in sequence, realizing rapid dissolution and uniformity of the material in the premixing tank; The external circulation passes through the premixing tank, pump two, automatic shut-off valve, automatic adjusting valve one, circulating tank car, pump one, automatic adjusting valve two and the premixing tank in sequence, realizing interactive circulation of the solution in the premixing tank and the circulating tank car; The solid feeding unit comprises a solid tank, an automatic regulating valve three, and a temperature control device, wherein the temperature control device adjusts the opening degree of the automatic regulating valve three through a temperature signal; The feeding device is used for quantitative feeding of materials. The nitrogen supply unit comprises a liquid nitrogen storage tank, a gasification pressure reducer, and a self-powered pressure reducing valve, and realizes graded supply of nitrogen. The controller is used for controlling the opening and closing of each component and parameter regulation.

[0006] As a further scheme of the present application, the liquid solvent conveying unit comprises pumps three, four, five, six and seven, and one end of each of the pumps is provided with a feeding tank car for storing liquid solvent. The flow meters one, two, three, four and five have an accuracy of one thousandth. The liquid level gauges interlock regulating valves one, two, three, four and five are used for automatic opening and closing according to the liquid level of the premix tank. The liquid solvent conveying unit realizes precise feeding of multiple groups of liquid materials through closed-loop control of the flow and liquid level by the controller.

[0007] As a further scheme of the present application, the inner circulation composed of the premix tank, the pump one and the automatic regulating valve two cooperates with the built-in stirring mechanism of the premix tank, is driven by the pump one, and realizes forced inner circulation of materials in the premix tank.

[0008] As a further scheme of the present application, the outer circulation composed of the premix tank, the pump two, the automatic cut-off valve, the automatic regulating valve one, the circulating tank car, the pump one and the automatic regulating valve two realizes bidirectional solution interaction between the premix tank and the circulating tank car through the cooperation of the pump two and the pump one.

[0009] As a further scheme of the present application, in the solid feeding unit, The temperature control device monitors the temperature in the premix tank in real time, and when the temperature exceeds the range, the automatic regulating valve three automatically adjusts the opening degree through the controller. When the liquid level of the premix tank reaches the rated liquid level, the automatic regulating valve three is controlled to be closed by the controller.

[0010] As a further scheme of the present application, the feeding device is positioned through a mechanical sliding rail, and the feeding device is connected with an electronic scale through the sliding rail for feeding weight feedback.

[0011] As a further scheme of the present application, in the nitrogen supply unit, The gasification pressure reducer is used for purging residual materials in the premix tank during the filling stage. The self-powered pressure reducing valve provides micro-positive pressure protection for the gas phase space of the system. The accumulated flow signals of flowmeter 1, flowmeter 2, flowmeter 3, flowmeter 4 and flowmeter 5 in the liquid solvent delivery unit and the liquid level signal of the premixing tank are received by the controller to control the opening and closing actions of liquid level meter interlocking regulating valve 1, liquid level meter interlocking regulating valve 2, liquid level meter interlocking regulating valve 3, liquid level meter interlocking regulating valve 4 and liquid level meter interlocking regulating valve 5.

[0012] The electrolyte production method comprises the following steps: S1 liquid solvent addition: Start the solution delivery unit and add liquid solvent into the premixing tank. When the liquid level reaches the set value, the controller closes the valve and triggers the internal circulation to achieve uniform stirring. S2 Molten solvent addition: switch to external circulation, control the liquid level in the premix tank to 700mm, and add molten solvent through the liquid solvent delivery unit. When the liquid level reaches 900-1000mm, close the valve, rely on the internal circulation to dissolve, and then use the external circulation to pump the material into the circulation tank truck. Control the liquid level in the cycle until the material feeding meets the standard. S3 solid material addition: Start the external circulation cooling, control the temperature of the premix tank to 8℃-2℃, switch to the internal circulation, interlock the temperature control device with the automatic regulating valve 3, add solid material at 8~15℃, close the valve when the liquid level reaches the standard, dissolve in the internal circulation, and then feed in the external circulation, and circulate until the feeding amount reaches the standard; S4 quantitative material addition: close pump 1 and automatic regulating valve 2 to reduce the liquid level to 700mm. The feeding device uses an electronic scale to add quantitative materials. When the standard is reached, the valve is closed. When the liquid level exceeds 1000mm, the external circulation reflux is triggered to control the liquid level. S5 finished product mixing: start external circulation, maintain the liquid level at 900~1000mm, and simultaneously start the premixing tank for stirring and coordinated mixing; S6 filling and purging: Close the liquid level gauge interlock regulating valve 1 and automatic regulating valve 2, pump the material into the circulating tank truck through the external circulation, introduce the 0.2MPa high-purity nitrogen output by the gasification pressure reducer, and purge the premix tank in the reverse direction along the external circulation to ensure that there is no material residue.

[0013] As a further solution of the present invention: in step S3: Cooling stage: external circulation is forced to start, and heat dissipation is enhanced through the interactive circulation of the premix tank and the circulation tank truck; Dosing stage: switch to internal circulation, the temperature control device adjusts the three openings of the automatic regulating valve in real time to ensure the temperature is between 8~15℃.

[0014] As a further solution of the present invention: in step S6, 0.2 MPa high-purity nitrogen is purged along the reverse path of the external circulation through the circulation tank truck, pump 1, automatic regulating valve 2, and premixing tank, and the residual pressure in the pipeline after pump 1 stops is used to completely push the material in the premixing tank into the circulation tank truck.

[0015] Beneficial effects of the present invention: (1) The present invention forms an internal circulation and stirring mechanism through the premixing tank, pump 1, automatic regulating valve 2, and premixing tank, thereby forming a synergistic effect of forced convection and shear stirring, shortening the dissolution time of the molten solvent and solid lithium salt, improving the mixing effect compared with simple stirring, and achieving higher mixing uniformity; (2) The present invention forms an external circulation through the premixing tank, pump 2, automatic shut-off valve, automatic regulating valve 1, circulation tank truck, pump 1, automatic regulating valve 2, and premixing tank to achieve two-way solution interaction between the premixing tank and the circulation tank truck, taking into account the liquid level control and cooling functions, and solving the problems of uneven mixing and slow cooling in a single circulation; (3) The addition of the molten solvent of the present invention is controlled by a closed-loop dual signal of a flow meter and a liquid level meter with a thousandth precision. The controller automatically closes the valve to stabilize the liquid level at the rated level with a small error. The solid feeding unit adopts a dual-condition linkage of the temperature and liquid level of the core area of ​​the tank bottom. The temperature control device adjusts the three openings of the automatic regulating valve in real time to ensure that the lithium salt dissolves stably without the risk of decomposition or overflow. The solid feeding stage switches to the internal circulation to prevent undissolved particles from entering the tank truck pipeline. The molten solvent is transferred through the external circulation after dissolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 is a flow chart of the present invention; Figure 2 yes Figure 1 A local diagram of Figure 1 ; Figure 3 yes Figure 1 A local diagram of Figure 2 .

[0018] In the figure: 1. Automatic regulating valve 1; 2. Automatic shut-off valve; 3. Automatic switching valve; 4. Automatic regulating valve 2; 5. Automatic regulating valve 3; 6. Automatic regulating valve 4; 7. Self-operated pressure reducing valve; 8. Liquid level gauge interlocking regulating valve 1; 9. Liquid level gauge interlocking regulating valve 2; 10. Liquid level gauge interlocking regulating valve 3; 11. Liquid level gauge interlocking regulating valve 4; 12. Liquid level gauge interlocking regulating valve 5; 13. Flow meter 1; 14. Flow meter 2; 15. Flow meter 3; 16. Flow meter 4; 17. Flow meter 5; 18. Pump 1; 19. Pump 2; 20. Pump 3; 21. Pump 4; 22. Pump 5; 23. Pump 6; 24. Pump 7; 25. Liquid nitrogen storage tank; 26. Vaporization pressure reducer; 27. Feeding device; 28. Solid tank; 29. ​​Premix tank; 30. Temperature control device; 31. Controller; 32. Circulating tank truck DETAILED DESCRIPTION

[0019] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of the present application.

[0020] Embodiment one Please refer to Figure 1-Figure 3 The present application is an electrolyte production device, which comprises a premixing tank 29, a built-in stirring mechanism for material mixing and internal circulation stirring; The liquid solvent conveying unit is used for feeding through a tank car on one side to realize accurate feeding of multiple groups of liquid; The circulation control unit comprises a pump one 18, a pump two 19, an automatic adjusting valve one 1, an automatic adjusting valve two 4, an automatic cut-off valve 2 and an automatic switch valve 3 to form internal circulation and external circulation; The internal circulation passes through the premixing tank 29, the pump one 18, the automatic adjusting valve two 4 and the premixing tank 29 in sequence to realize rapid dissolution and homogenization of the material in the premixing tank 29; The external circulation passes through the premixing tank 29, the pump two 19, the automatic cut-off valve 2, the automatic adjusting valve one 1, the circulating tank car 32, the pump one 18, the automatic adjusting valve two 4 and the premixing tank 29 in sequence to realize interactive circulation of the solution in the premixing tank 29 and the circulating tank car 32; The solid feeding unit comprises a solid tank 28, an automatic adjusting valve three 5 and a temperature control device 30, wherein the temperature control device 30 adjusts the opening degree of the automatic adjusting valve three 5 through a temperature signal; The feeding device 27 is used for quantitative feeding of the material; The nitrogen supply unit comprises a liquid nitrogen storage tank 25, a gasification pressure reducer 26 and a self-operated pressure reducing valve 7 to realize graded supply of nitrogen; The controller 31 is used for controlling the opening and closing of the actions of the components and the parameter regulation.

[0021] It should be noted that the controller 31 is electrically connected with the premixing tank 29, the liquid solvent conveying unit, the circulation control unit, the solid feeding unit, the feeding device 27 and the nitrogen supply unit and controls the opening and closing of the actions of the components and the parameter regulation through wireless signal transmission.

[0022] Preferably, the liquid solvent conveying unit comprises a pump three 20, a pump four 21, a pump five 22, a pump six 23 and a pump seven 24, and a feeding tank car is arranged at one end of each of the pumps to store the liquid solvent; The flow meters one 13, two 14, three 15, four 16 and five 17 have an accuracy of one thousandth; Liquid level gauge interlocking regulating valve 1 8, liquid level gauge interlocking regulating valve 2 9, liquid level gauge interlocking regulating valve 3 10, liquid level gauge interlocking regulating valve 4 11, and liquid level gauge interlocking regulating valve 5 12 are used to automatically open and close according to the liquid level in the premix tank 29; The liquid solvent delivery unit controls the flow rate and liquid level in a closed loop through the controller 31, thereby achieving accurate dosing of multiple groups of liquid materials.

[0023] In the present invention, preferably, the internal circulation composed of the premixing tank 29, the pump 18, and the automatic regulating valve 24 cooperates with the stirring mechanism built into the premixing tank 29, and is driven by the pump 18 to realize the forced internal circulation of the material in the premixing tank 29.

[0024] It should be noted that the internal circulation and the stirring of the stirring mechanism in the premixing tank 29 can increase the material dissolution rate compared to simple stirring.

[0025] In the present invention, preferably, the external circulation composed of the premixing tank 29, pump 19, automatic shut-off valve 2, automatic regulating valve 1, circulation tanker 32, pump 18, and automatic regulating valve 24 realizes two-way solution interaction between the premixing tank 29 and the circulation tanker 32 through the coordination of pump 19 and pump 18.

[0026] More specifically: when the liquid level in the premix tank 29 is greater than 1000 mm, the automatic shut-off valve 2 is closed and the automatic regulating valve 2 4 is opened to reduce the liquid level to 900-1000 mm; When the liquid level is greater than or equal to 900 mm, pump 18 starts to add material to maintain a stable liquid level and realize two-way solution interactive regulation.

[0027] Preferably, in the solid feeding unit of the present invention; The temperature control device 30 monitors the temperature in the premixing tank 29 in real time. When the temperature exceeds the rated range, the automatic regulating valve 3 5 automatically adjusts the opening through the controller 31; When the liquid level in the premixing tank 29 reaches the rated liquid level, the automatic regulating valve 3 5 is controlled to close by the controller 31 .

[0028] More specifically: in the solid feeding unit, the temperature sensor of the temperature control device 30 is built into the bottom of the premixing tank 29 (the core area of ​​material flow) to collect temperature in real time; When the temperature is greater than 15°C, the opening of the automatic regulating valve 35 will decrease, and when the temperature is less than 8°C, the opening will increase to ensure that the temperature is stable at 8~15°C; When the liquid level in the premix tank 29 reaches 900-1000 mm, the automatic regulating valve 35 is forced to close through the controller 31, realizing the dual condition interlocking of temperature and liquid level.

[0029] It should be noted that the temperature rating range is 8~15℃.

[0030] Preferably in the present invention, the feeding device 27 is positioned by a mechanical slide rail, and the feeding device 27 is connected to an electronic scale via the slide rail for feeding back the feeding weight.

[0031] It should be noted that the mechanical slide rail is equipped with a clamping device that clamps and moves the feeding device 27 to a designated position by receiving a wireless signal from the controller 31; The electronic scale feeds back the weight change in real time. When the feeding amount reaches the set value, the controller 31 immediately sends a signal to close the material pipeline valve.

[0032] Preferably, in the nitrogen supply unit of the present invention: The gasification pressure reducer 26 is used to purge the residual material in the premix tank 29 during the filling stage; Self-operated pressure reducing valve 7 provides slight positive pressure protection for the gas phase space of the system; The accumulated flow signals of flow meter 1 13, flow meter 2 14, flow meter 3 15, flow meter 4 16, and flow meter 5 17 in the liquid solvent delivery unit and the liquid level signal of the premixing tank 29 are received by the controller 31 to control the opening and closing actions of the liquid level meter interlocking regulating valve 1 8, liquid level meter interlocking regulating valve 2 9, liquid level meter interlocking regulating valve 3 10, liquid level meter interlocking regulating valve 4 11, and liquid level meter interlocking regulating valve 5 12.

[0033] Example 2 The electrolyte production method comprises the following steps: S1 liquid solvent addition: start the solution delivery unit and add liquid solvent into the premixing tank 29. When the liquid level reaches the set value, the controller 31 is controlled to close the valve and trigger the internal circulation to achieve stirring and homogenization; S2 Molten solvent addition: switch to external circulation, control the liquid level of the premixing tank 29 to 700mm, and add molten solvent through the liquid solvent delivery unit. When the liquid level reaches 900-1000mm, close the valve, rely on the internal circulation to dissolve, and then feed the material to the circulation tank car 32 through the external circulation. Circulate and control the liquid level until the material feeding meets the standard; S3 solid material addition: start external circulation cooling, control the temperature of premixing tank 29 to 8℃-2℃, switch to internal circulation, interlock the temperature control device 30 with automatic regulating valve 35, add solid material at 8~15℃, close the valve when the liquid level reaches the standard, dissolve in the internal circulation, and then feed in the external circulation, and circulate until the feeding amount reaches the standard; S4 quantitative material addition: turn off pump 18 and automatic regulating valve 24 to reduce the liquid level to 700mm. The feeding device 27 uses an electronic scale to add quantitative material. When the standard is reached, the valve is closed. When the liquid level exceeds 1000mm, the external circulation reflux control liquid level is triggered; S5 Finished product mixing: Start external circulation, maintain the liquid level at 900-1000mm, and simultaneously start premixing tank 29 for stirring and synergistic mixing; S6 Filling and purging: Close the liquid level gauge interlocking regulating valve 1 8 and the automatic regulating valve 2 4, pump the material to the circulation tank car 32 through the external circulation, introduce the 0.2MPa high-purity nitrogen output by the gasification pressure reducer 26, and purge the premixing tank 29 in the reverse direction along the external circulation to ensure that there is no material residue.

[0034] Preferably, in step S3 of the present invention: Cooling stage: external circulation is forced to start, and heat dissipation is enhanced through the interactive circulation of the premixing tank 29 and the circulation tank car 32; Dosing stage: switch to internal circulation, the temperature control device 30 adjusts the opening of the automatic regulating valve 35 in real time to ensure that the temperature is between 8~15℃.

[0035] Preferably, in step S6 of the present invention, 0.2 MPa high-purity nitrogen is purged along the reverse path of the external circulation through the circulation tank truck 32, pump 18, automatic regulating valve 24, and premixing tank 29, and the residual pressure in the pipeline after pump 18 stops is used to completely push the material in the premixing tank 29 into the circulation tank truck 32.

[0036] More specific implementation steps: S1 liquid solvent addition: Start the delivery unit: the controller 31 sends a signal to start pump 3 20, pump 4 21, pump 5 22, pump 6 23, and pump 7 24 of the liquid solvent delivery unit, and the corresponding feed tank truck delivers the liquid solvent to the premix tank 29 through the pipeline; Metering and control: The liquid solvent is measured in sequence by flow meter 1 13, flow meter 2 14, flow meter 3 15, flow meter 4 16, and flow meter 5 17 (with an accuracy of one thousandth), and then enters the premix tank 29 through the liquid level meter interlocking regulating valve 1 8, liquid level meter interlocking regulating valve 2 9, liquid level meter interlocking regulating valve 3 10, liquid level meter interlocking regulating valve 4 11, and liquid level meter interlocking regulating valve 5 12; Valve closing triggering condition: When the liquid level gauge of the premix tank 29 detects that the liquid level reaches the set value of 900-1000mm, or the accumulated flow of flow meter 13 to flow meter 5 17 reaches the preset value, the controller 31 receives the signal and closes the corresponding liquid level gauge interlocking regulating valve 18 to liquid level gauge interlocking regulating valve 5 12; Internal circulation start: The controller 31 triggers the internal circulation, starts the pump 18, opens the automatic regulating valve 24, and the material circulates along the path of the premixing tank 29, the pump 18, the automatic regulating valve 24, and the premixing tank 29. At the same time, the built-in stirring mechanism of the premixing tank 29 is started, and the material is homogenized through the synergy of internal circulation and stirring.

[0037] S2 molten solvent addition: Circulation switching: The controller 31 sends a signal to close the automatic shut-off valve 2 and open the automatic on-off valve 3, switching the circulation path to the internal circulation (closing the external circulation). At this time, the liquid level in the premix tank 29 is controlled at 700 mm by the coordinated control of the pump 18 and the automatic regulating valve 2 4; Molten solvent delivery: start pump 3 20 to pump 7 24 of the liquid solvent delivery unit, and the molten solvent is delivered to the premixing tank 29 through flow meter 13 to flow meter 5 17, and level meter interlocking regulating valve 1 8 to level meter interlocking regulating valve 5 12; Valve closing and dissolving: When the liquid level in the premixing tank 29 reaches 900-1000 mm, the controller 31 closes the corresponding liquid level gauge interlock regulating valve, and relies on the internal circulation: pump 18, automatic regulating valve 24, and stirring mechanism to continue running for 10-15 minutes to fully dissolve the molten solvent; External circulation feeding: The controller 31 opens the automatic shut-off valve 2, closes the automatic switch valve 3, switches to the external circulation, starts the pump 2 19, and the material is fed to the circulation tank car 32 along the path of the premixing tank 29, the pump 2 19, the automatic shut-off valve 2, the automatic regulating valve 1, and the circulation tank car 32; Liquid level circulation control: When the circulation tank car 32 receives the material, if the liquid level in the premixing tank 29 is lower than 900mm, the controller 31 starts the pump 18 and opens the automatic regulating valve 24, and pumps the material in the circulation tank car 32 back to the premixing tank 29 along the circulation tank car 32, pump 18, automatic regulating valve 24, and premixing tank 29. The liquid level in the premixing tank 29 is maintained at 900~1000mm through the proportional control of closing the automatic regulating valve 1 and opening the automatic regulating valve 24, until the flow meter 13~flow meter 5 17 detects that the molten solvent feed amount meets the standard.

[0038] S3 solid material addition: External circulation cooling: Controller 31 starts the external circulation, opens pump 2 19, automatic shut-off valve 2, automatic regulating valve 1, pump 18, and automatic regulating valve 2 4, and the material circulates along the path of premixing tank 29, pump 2 19, automatic shut-off valve 2, automatic regulating valve 1, circulation tank car 32, pump 18, automatic regulating valve 2 4, and premixing tank 29. The heat dissipation is enhanced through the interaction between the solutions in the premixing tank 29 and the circulation tank car 32. Temperature reduction reaches the standard: when the temperature control device 30 (the sensor is located in the core area of ​​the material at the bottom of the tank) in the premixing tank 29 detects that the temperature has dropped to 8°C ± 2°C, the controller 31 stops cooling; Circulation switching and liquid level control: close the automatic shut-off valve 2, open the automatic switch valve 3, switch to the internal circulation, and control the liquid level of the premix tank 29 at 700mm through the pump 18 and the automatic regulating valve 2 4; Solid feeding control: The controller 31 opens the automatic regulating valve 3 5, and the solid material in the solid tank 28 enters the premixing tank 29. The temperature control device 30 monitors the temperature in real time: If the temperature is greater than 15°C, the controller 31 closes the opening of the automatic regulating valve 35; If the temperature is less than 8°C, the controller 31 opens the automatic regulating valve 35 to ensure that the temperature is stable at 8~15°C; Valve closing and dissolving: When the liquid level in the premixing tank 29 reaches 900-1000 mm, the controller 31 forcibly closes the automatic regulating valve 3 5, and the internal circulation: pump 18, automatic regulating valve 2 4, and stirring are operated for 15-20 minutes to fully dissolve the solid material; External circulation feeding cycle: open the automatic shut-off valve 2, close the automatic switch valve 3, switch to the external circulation, and use the pump 2 19 to pump the material to the circulation tank car 32. When the liquid level of the premixing tank 29 is lower than 900mm, start the pump 18 to pump the material back to the circulation tank car 32, and repeat the feeding, dissolving and feeding cycle until the solid material feeding amount meets the standard.

[0039] S4 quantitative material addition: Liquid level adjustment: Controller 31 turns off pump 18 and automatic regulating valve 2 4, and the liquid level in premix tank 29 naturally drops to 700 mm; Quantitative feeding preparation: The feeding device 27 receives the wireless signal from the controller 31 through a mechanical slide rail (equipped with a clamping device), clamps the barreled material and moves it above the electronic scale; Quantitative dosing: Open the valve of the barreled material pipeline and add the material to the premix tank 29. The electronic scale feeds back the weight to the controller 31 in real time. When the feeding amount reaches the set value, the controller 31 closes the pipeline valve; Liquid level over-limit control: If the liquid level in the premix tank 29 exceeds 1000mm during the feeding process, the controller 31 immediately starts the external circulation: pump 2 19, automatic shut-off valve 2, automatic regulating valve 1, pump 1 18, automatic regulating valve 2 4, and diverts the liquid level to 900~1000mm through the circulation tank car 32.

[0040] S5 finished product mix: External circulation start: Controller 31 starts pump 2 19 and pump 1 18, opens automatic shut-off valve 2, automatic regulating valve 1 and automatic regulating valve 2 4, and the material forms an external circulation along the path of premixing tank 29, pump 2 19, automatic shut-off valve 2, automatic regulating valve 1, circulation tanker 32, pump 18, automatic regulating valve 2 4 and premixing tank 29; Liquid level and stirring coordination: The liquid level of the premixing tank 29 is stabilized at 900~1000mm through external circulation. At the same time, the built-in stirring mechanism of the premixing tank 29 is started at high speed. The macro convection of the external circulation and the shear flow of the stirring are coordinated to improve the mixing efficiency.

[0041] S6 Canning and Purging: Material transfer: Controller 31 closes level gauge interlocking regulating valve 1-8, level gauge interlocking regulating valve 5-12, and automatic regulating valve 2-4, leaving only the external circulation path of premixing tank 29, pump 2-19, automatic shut-off valve 2, automatic regulating valve 1-1, and circulation tanker 32, pumping all the material in premixing tank 29 to circulation tanker 32; Nitrogen purge preparation: Controller 31 turns off pump 2 19 and automatic shut-off valve 2, opens automatic regulating valve 2 4, and connects the pipeline of vaporizer 26 to circulation tanker 32 (vaporizer 26 vaporizes the liquid nitrogen in liquid nitrogen storage tank 25 and outputs 0.2 MPa high-purity nitrogen); Reverse purge: High-purity nitrogen is purged in the reverse direction along the path of the circulation tank car 32, pump 18, automatic regulating valve 24, and premixing tank 29. The residual pressure in the pipeline after the pump 18 stops is used to completely push the residual material in the premixing tank 29 to the circulation tank 32. Completion and disconnection: After purging for 3 to 5 minutes, close the gasification pressure reducer 26, disconnect the circulation tank car 32 from the device, and complete production.

[0042] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An electrolyte production device, characterized in that: It includes a premixing tank (29) with a built-in stirring mechanism for mixing materials and internal circulation stirring; Liquid solvent delivery unit, which is fed by a tank truck on one side to achieve precise dosing of multiple groups of liquids; A circulation control unit, the circulation control unit comprising pump 1 (18), pump 2 (19), automatic regulating valve 1 (1), automatic regulating valve 2 (4), automatic shut-off valve (2), and automatic switch valve (3), forming an internal circulation and an external circulation; The internal circulation sequentially passes through the premixing tank (29), pump 1 (18), automatic regulating valve 2 (4), and premixing tank (29), thereby achieving rapid dissolution and homogenization of the materials in the premixing tank (29); The external circulation sequentially passes through the premixing tank (29), pump 2 (19), automatic shut-off valve (2), automatic regulating valve 1 (1), circulation tank car (32), pump 1 (18), automatic regulating valve 2 (4), and premixing tank (29), thereby realizing interactive circulation between the solution in the premixing tank (29) and the circulation tank car (32); Solid feeding unit: comprising a solid tank (28), an automatic regulating valve three (5), and a temperature control device (30), wherein the temperature control device (30) adjusts the opening of the automatic regulating valve three (5) according to a temperature signal; A feeding device (27) for feeding materials in a quantitative manner; Nitrogen supply unit: including a liquid nitrogen storage tank (25), a gasification pressure reducer (26), and a self-operated pressure reducing valve (7), to realize nitrogen graded supply; The controller (31) is used to control the opening and closing of the various components and adjust the parameters.

2. The electrolyte production device according to claim 1, characterized in that: The liquid solvent delivery unit includes pump three (20), pump four (21), pump five (22), pump six (23), and pump seven (24), and one end of each pump is provided with a feed tank car, and the feed tank car is used to store the liquid solvent; Flow meter one (13), flow meter two (14), flow meter three (15), flow meter four (16), flow meter five (17) with an accuracy of one thousandth; Liquid level gauge interlocking regulating valve 1 (8), liquid level gauge interlocking regulating valve 2 (9), liquid level gauge interlocking regulating valve 3 (10), liquid level gauge interlocking regulating valve 4 (11), and liquid level gauge interlocking regulating valve 5 (12) are used to automatically open and close according to the liquid level of the premix tank (29); The liquid solvent delivery unit performs closed-loop control of flow rate and liquid level through a controller (31), thereby achieving accurate dosing of multiple groups of liquid materials.

3. The electrolyte production device according to claim 1, characterized in that: The internal circulation composed of the premixing tank (29), pump 1 (18), and automatic regulating valve 2 (4) cooperates with the stirring mechanism built into the premixing tank (29), and is driven by pump 1 (18) to realize forced internal circulation of the materials in the premixing tank (29).

4. The electrolyte production device according to claim 1, characterized in that: The external circulation composed of the premixing tank (29), pump 2 (19), automatic shut-off valve (2), automatic regulating valve 1 (1), circulation tank car (32), pump 1 (18), and automatic regulating valve 2 (4) realizes two-way solution interaction between the premixing tank (29) and the circulation tank car (32) through the cooperation of pump 2 (19) and pump 1 (18).

5. The electrolyte production device according to claim 1, characterized in that: In the solid feeding unit; The temperature control device (30) monitors the temperature in the premixing tank (29) in real time. When the temperature exceeds the rated range, the automatic regulating valve (5) automatically adjusts the opening through the controller (31); When the liquid level of the premixing tank (29) reaches the rated liquid level, the automatic regulating valve (5) is closed by the controller (31).

6. The electrolyte production device according to claim 1, characterized in that: The feeding device (27) is positioned via a mechanical slide rail, and the feeding device (27) is connected to an electronic scale via the slide rail for feeding back the feeding weight.

7. The electrolyte production device according to claim 1, characterized in that: In the nitrogen supply unit: A gasification pressure reducer (26) is used to purge residual materials in the premix tank (29) during the filling stage; Self-operated pressure reducing valve (7) provides slight positive pressure protection for the gas phase space of the system; The accumulated flow signals of flow meter 1 (13), flow meter 2 (14), flow meter 3 (15), flow meter 4 (16), and flow meter 5 (17) in the liquid solvent delivery unit and the liquid level signal of the premixing tank (29) are received by the controller (31) to control the opening and closing actions of liquid level meter interlocking regulating valve 1 (8), liquid level meter interlocking regulating valve 2 (9), liquid level meter interlocking regulating valve 3 (10), liquid level meter interlocking regulating valve 4 (11), and liquid level meter interlocking regulating valve 5 (12).

8. A method for producing an electrolyte, comprising: using an electrolyte production device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1 liquid solvent addition: start the solution delivery unit and add liquid solvent into the premixing tank (29). When the liquid level reaches the set value, the controller (31) closes the valve and triggers the internal circulation to achieve stirring and homogenization. S2 Molten solvent addition: switch to external circulation, control the liquid level of the premixing tank (29) to 700mm, and add molten solvent through the liquid solvent delivery unit. When the liquid level reaches 900-1000mm, close the valve, rely on the internal circulation to dissolve, and then use the external circulation to pump the material to the circulation tank car (32). Circulate and control the liquid level until the material reaches the standard; S3 solid material addition: start the external circulation cooling, control the temperature of the premixing tank (29) to 8℃-2℃, switch to the internal circulation, and interlock the temperature control device (30) with the automatic regulating valve three (5). Add solid material at 8~15℃, close the valve when the liquid level reaches the standard, dissolve in the internal circulation, and then feed in the external circulation, and circulate until the feeding amount reaches the standard; S4 quantitative material addition: turn off pump 1 (18) and automatic regulating valve 2 (4) to reduce the liquid level to 700mm, and the feeding device (27) quantitatively adds materials through the electronic scale. When the standard is reached, the valve is closed. When the liquid level exceeds 1000mm, the external circulation reflux control liquid level is triggered; S5 Finished product mixing: Start the external circulation, maintain the liquid level at 900-1000 mm, and simultaneously start the premixing tank (29) for stirring and synergistic mixing; S6 Filling and purging: Close the level gauge interlock regulating valve 1 (8) and the automatic regulating valve 2 (4), pump the material to the circulating tank car (32) through the external circulation, introduce the 0.2MPa high-purity nitrogen output by the gasification pressure reducer (26), and purge the premixing tank (29) in the reverse direction along the external circulation to ensure that there is no material residue.

9. The method for producing an electrolyte according to claim 8, characterized in that: In step S3: Cooling stage: external circulation is forced to start, and heat dissipation is enhanced through the interactive circulation of the premixing tank (29) and the circulation tank car (32); Dosing stage: switch to internal circulation, the temperature control device (30) adjusts the opening of the automatic regulating valve three (5) in real time to ensure that the temperature is between 8 and 15 °C.

10. The method for producing an electrolyte according to claim 8, characterized in that: In step S6, 0.2 MPa high-purity nitrogen is purged along the reverse path of the external circulation through the circulation tank car (32), pump 1 (18), automatic regulating valve 2 (4), and premixing tank (29), and the residual pressure in the pipeline after pump 1 (18) stops is used to completely push the material in the premixing tank (29) into the circulation tank car (32).

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