High-precision lithium battery solvent filling system

Abstract

The utility model relates to the technical field of lithium battery solvent filling, in particular to a high-precision lithium battery solvent filling system which comprises a metering and storing module I, a conveying power module II, a conveying pipeline module III, a precision checking module IV, a filling module V and a control module / software. The metering and storage module I comprises a metering tank and a high-precision electronic scale, the metering tank is provided with a metering tank liquid level meter, a vacuum valve, a pressure breaking valve and a metering tank pressure sensor, and the high-precision electronic scale is installed at the bottom of the metering tank. And meanwhile, the device is suitable for lithium battery solvent filling under various working conditions and filling systems with similar requirements in other industries, and is very practical.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery solvent filling, in particular to a high-precision lithium battery solvent filling system. Background Art

[0002] At present, lithium batteries on the market have different performance requirements, and various solvents are added to the materials. As the market demand for lithium battery energy density continues to increase, lithium battery manufacturers have higher and higher requirements for the precision of raw material ratios. At present, most of the solvent filling system pipelines on the market are not installed properly, and the variable frequency motor used in the screw pump is difficult to control, resulting in poor conveying accuracy and long debugging time, which cannot meet the rapid development of the lithium battery industry.

[0003] Therefore, it is necessary to design a high-precision lithium battery solvent filling system to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of the utility model is to provide a high-precision lithium battery solvent filling system to improve the convenient operation, safe use, high intelligence and high delivery accuracy of the lithium battery solvent filling system, thereby solving the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A high-precision lithium battery solvent filling system, including a metering and storage module I, a conveying power module II, a conveying pipeline module III, an accuracy verification module IV, a filling module V and a control module / software, wherein the metering and storage module I includes a metering tank equipped with a metering tank level gauge, a vacuum valve, a pressure relief valve, a metering tank pressure sensor and a high-precision floor scale installed at the bottom thereof;

[0007] The delivery power module II includes a metering screw pump and a servo motor;

[0008] The conveying pipeline module III comprises a feed hose equipped with a feed pneumatic valve, a discharge hose equipped with a discharge pneumatic valve, and a conveying pipeline equipped with a conveying pressure sensor, a conveying pressure gauge, a check pneumatic valve, a check valve, and a maintenance hand valve, and a circulation pipeline equipped with a main pressure sensor, a bubble detector, an exhaust pipeline, a circulation pipeline of a circulation valve, and a reflux hose equipped with a reflux valve. The feed hose and the reflux hose are respectively connected to both sides of the top of the metering tank, the discharge hose is connected between the bottom of the metering tank and the top input end of the metering screw pump, the output end of one side of the metering screw pump is fixedly connected to the conveying pipeline, and the conveying pipeline, the circulation pipeline and the reflux hose are connected through each other;

[0009] The precision verification module IV includes a verification tee, a verification hand valve A, a verification pneumatic valve A, a verification pipeline, a verification pneumatic valve B, a verification back pressure valve, and a verification hand valve B;

[0010] The filling module V includes a filling tee, a filling manual valve A, a filling pneumatic valve A, a filling pipeline, a filling pneumatic valve B, a filling back pressure valve, a filling hose and required equipment. One end of the filling pipeline is connected to the delivery pipeline by the filling tee, and the other end of the filling pipeline is connected to the required equipment by the filling hose.

[0011] As a preferred solution of the utility model, the metering tank is placed above a high-precision floor scale and kept horizontal. The volume of the metering tank is manufactured according to specified requirements, and its volume is often greater than the sum of the single filling amounts of all filling ports. The metering tank can be any one of a normal pressure tank for pumping feeding or a negative pressure tank for vacuum loading as required.

[0012] As a preferred solution of the utility model, the high-precision floor scale and the weighing meter connected and installed on one side are an integrated structure, which adapts the accuracy level of the weighing module according to actual needs, wherein the weighing module is integrated with the weighing platform of the high-precision floor scale as a whole, and the accuracy is higher. The total range of the high-precision floor scale is greater than the sum of the weight of the equipment installed on the metering tank and the highest liquid level material. It is installed on a horizontal plane, and the accuracy of the scale itself is achieved by adjusting the level of the weighing platform. The weighing data of the high-precision floor scale is read by the weighing meter and transmitted to the PLC to achieve accurate weighing of materials.

[0013] As a preferred solution of the utility model, the delivery flow of the metering screw pump meets the maximum flow requirement of the system. Its core components are the stator and the rotor, which are made of EPDM and 316 materials respectively, and rotate without metal friction. The metering screw pump is driven by the servo motor, and the servo motor can accurately control the rotation speed and has strong braking performance, and can quickly improve the metering screw pump to achieve the specified delivery accuracy.

[0014] As a preferred solution of the utility model, the feed pneumatic valve automatically switches to replenish or stop replenishing liquid according to the liquid level of the material measured by the metering tank level gauge in the metering tank.

[0015] As a preferred solution of the utility model, the feed hose, the discharge hose and the return hose are all connected to the metering tank, and the feed hose, the discharge hose and the return hose are all installed horizontally to prevent the pipeline from squeezing the metering tank and affecting the metering accuracy.

[0016] As a preferred solution of the utility model, the discharging pneumatic valve and the check pneumatic valve are opened when there is a demand for filling and closed when the filling is completed. The discharging pneumatic valve prevents the material from entering the metering screw pump due to gravity to form internal pressure, and the check pneumatic valve prevents the residual pressure in the pipeline after the filling is completed from entering the metering screw pump to form an impact.

[0017] As a preferred solution of the utility model, the delivery pressure sensor is used for the system to monitor the outlet pressure of the metering screw pump in real time to determine the delivery conditions, and the delivery pressure gauge is used to observe the outlet pressure on site during maintenance for safe maintenance. The check valve is a one-way design, and the maintenance hand valve is mainly used to manually cut off the material in the main pipeline. The main pipe pressure sensor is mainly used to detect the pressure of the main pipeline during the filling process and the static process to provide a basis for whether to release the pressure under static conditions. The bubble detector provides a switching signal for the system. When there is air in the pipeline, the detector probe contacts the air and the system alarms. The bubble detector provides a switching signal for the system. When there is air in the pipeline, the detector probe contacts the air and the system alarms.

[0018] As a preferred solution of the utility model, the conveying pipeline is led out from the outlet of the metering screw pump to the filling pipeline. The entire pipeline is uphill and the pipeline is sloped upward at a high point at 3-5°, so that during the debugging process, the material starts to fill the entire conveying pipeline from a low position to reduce the bubble rate and ensure the filling accuracy. The exhaust pipeline is located at the end of the conveying pipeline and the vertical upward height exceeds the conveying pipeline by 0.5-1 meter. The exhaust pipeline forms the high position of the entire conveying pipeline so that the conveying pipeline remains filled during the conveying process, and trace bubbles gather on the exhaust pipeline to reduce the impact on the filling accuracy.

[0019] As a preferred solution of the utility model, the circulation valve is located at the end of the exhaust pipe to cut off the conveying pipeline to prevent materials from entering the circulation pipeline and affecting the filling accuracy; the reflux valve is located at the end of the circulation pipe before it enters the metering tank to prevent materials in the circulation pipe from dripping and affecting the filling accuracy. The circulation valve is located at the end of the exhaust pipe to cut off the conveying pipeline to prevent materials from entering the circulation pipeline and affecting the filling accuracy; the reflux valve is located at the end of the circulation pipe before it enters the metering tank to prevent materials in the circulation pipe from dripping and affecting the filling accuracy.

[0020] As a preferred solution of the utility model, the three-way port of the calibration tee is installed downward to facilitate the filling of the calibration pipeline with materials, and no high-level bubble gathering point is formed to ensure the filling accuracy. The calibration hand valve A is used for the maintenance of the entire calibration module without affecting other ports. The calibration hand valve B is an end stop valve to prevent material spraying due to misoperation by personnel. The calibration pneumatic valve A and the calibration pneumatic valve B are double pneumatic valve designs that can effectively prevent pipeline vibration when filling at other ports. At the same time, the double pneumatic valve design can effectively reduce the risk of valve internal leakage. The calibration back pressure valve is pre-adjusted to a certain pressure of about 1 bar. When filling materials, it needs to exceed the pre-adjusted pressure before it can be opened for filling. The function of the calibration back pressure valve is to maintain a certain pressure at the outlet during the filling process, and the pipeline will not be directly emptied due to the weight of the material, so that the pipeline is always in a full pipe state. When the system stops filling, the calibration back pressure valve can also form double protection to reduce the accuracy risk caused by valve internal leakage.

[0021] As a preferred solution of the utility model, the control module / software is the control center of the entire system, providing action instructions and various error-proofing and fool-proofing logics to coordinate the actions of various devices to ensure that the system fills materials to the designated terminal at a specified weight and precision.

[0022] Beneficial effect: The utility model comprises a metering and storage module, a conveying power module, a conveying pipeline module, an accuracy verification module and a filling module, which constitute the hardware part of the system, and coordinates the hardware to work according to the specified instructions through the control module / software, so as to realize the safe filling of materials into the specified equipment according to the specified weight and the specified accuracy, and the operation is simple. The utility model has the advantages of simple operation, safe use, high intelligence, high conveying accuracy and high filling accuracy control. At the same time, it is suitable for the filling of lithium battery solvents in various working conditions: such as NMP, CNT, I SC-1, DT-1, DIW, BI-4, BD-3, SBR, L136D, etc., and is also suitable for filling systems with similar needs in other industries, which is very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall process of a high-precision lithium battery solvent filling system of the utility model;

[0024] Figure 2 This is a schematic diagram of a metering and storage module of a high-precision lithium battery solvent filling system of the utility model;

[0025] Figure 3 This is a schematic diagram of a delivery power module of a high-precision lithium battery solvent filling system of the utility model;

[0026] Figure 4 This is a schematic diagram of a delivery pipeline module of a high-precision lithium battery solvent filling system of the utility model;

[0027] Figure 5 This is a schematic diagram of an accuracy calibration module of a high-precision lithium battery solvent filling system of the utility model;

[0028] Figure 6 This is a schematic diagram of a filling module of a high-precision lithium battery solvent filling system of the utility model;

[0029] Figure 7 This is a control module / software schematic diagram of a high-precision lithium battery solvent filling system of the utility model.

[0030] In the figure: 100, metering and storage module I; 200, conveying power module II; 300, conveying pipeline module III; 400, precision verification module IV; 500, filling module V; 600, control module / software; 1, feed pneumatic valve; 2, feed hose; 3, metering tank level gauge; 4, vacuum valve; 5, pressure relief valve; 6, metering tank pressure sensor; 7, metering tank; 8, high-precision floor scale; 9, discharge hose; 10, discharge pneumatic valve; 11, metering screw pump; 12, servo motor; 13, conveying pressure sensor; 14, conveying pressure gauge; 15, check pneumatic valve; 16, check valve ; 17. Repair manual valve; 18. Delivery pipeline; 19. Check tee; 20. Check manual valve A; 21. Check pneumatic valve A; 22. Check pipeline; 23. Check pneumatic valve B; 24. Check back pressure valve; 25. Check manual valve B; 26. Fill tee; 27. Fill manual valve A; 28. Fill pneumatic valve A; 29. ​​Fill pipeline; 30. Fill pneumatic valve B; 31. Fill back pressure valve; 32. Fill hose; 33. Required equipment; 34. Main pressure sensor; 35. Bubble detector; 36. Exhaust pipeline; 37. Circulation valve; 38. Circulation pipeline; 39. Reflux valve; 40. Reflux hose. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant literature, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0035] See also Figure 1-7 , the utility model provides a technical solution:

[0036] A high-precision lithium battery solvent filling system includes a metering and storage module I100, a conveying power module II200, a conveying pipeline module III300, an accuracy verification module IV400, a filling module V500 and a control module / software 600.

[0037] like Figure 1 and Figure 2 As shown, specifically, the metering and storage module I100 includes a metering tank 7 equipped with a metering tank level gauge 3, a vacuum valve 4, a pressure relief valve 5, and a metering tank pressure sensor 6, and a high-precision floor scale 8 installed at the bottom thereof. The metering tank 7 is placed above the high-precision floor scale 8 and kept horizontal. The volume of the metering tank 7 is manufactured according to specified requirements, and its volume is often greater than the sum of the single filling amounts of all filling ports. The metering tank 7 can be any one of a normal pressure tank for pumping feeding or a negative pressure tank for vacuum feeding as required. The high-precision floor scale 8 and the weighing instrument connected and installed on one side are an integrated structure, which adapts the accuracy level of the weighing module according to actual needs, wherein the weighing module is integrated with the weighing platform of the high-precision floor scale 8, and the accuracy is higher. The total range of the high-precision floor scale 8 is greater than the sum of the equipment installed on the metering tank 7 and the weight of the material at the highest liquid level. It is installed on a horizontal plane, and the accuracy of the scale itself is achieved by adjusting the level of the weighing platform. The weighing data of the high-precision floor scale 8 is read by the weighing instrument and transmitted to the PLC to achieve accurate weighing of the material.

[0038] like Figure 1 and Figure 3As shown, preferably, the conveying power module 11200 includes a metering screw pump 11 and a servo motor 12. The conveying flow of the metering screw pump 11 meets the maximum flow demand of the system. Its core components are the stator and the rotor, which are made of EPDM and 316 materials respectively, and rotate without metal friction. The metering screw pump 11 is driven by the servo motor 12. The servo motor 12 can accurately control the speed and has strong braking performance, and can quickly improve the metering screw pump 11 to achieve the specified conveying accuracy.

[0039] like Figure 1 and Figure 4As shown, preferably, the conveying pipeline module III 300 includes a feed hose 2 equipped with a feed pneumatic valve 1, a discharge hose 9 equipped with a discharge pneumatic valve 10, a conveying pipeline 18 equipped with a conveying pressure sensor 13, a conveying pressure gauge 14, a check pneumatic valve 15, a check valve 16, a maintenance hand valve 17, and a circulation pipeline 38 equipped with a main pipe pressure sensor 34, a bubble detector 35, an exhaust pipeline 36, a circulation valve 37, and a reflux hose 40 equipped with a reflux valve 39. The feed hose 2 and the reflux hose 40 are respectively connected to both sides of the top of the metering tank 7, and the discharge hose 9 is connected between the bottom of the metering tank 7 and the top input end of the metering screw pump 11. The output end of one side of the screw pump 11 is fixedly connected to the conveying pipeline 18, and the conveying pipeline 18 is connected to the circulation pipeline 38 and the return hose 40. The feed pneumatic valve 1 automatically switches to replenish or stop replenishing the liquid according to the liquid level of the material measured by the metering tank level gauge 3 in the metering tank 7. The feed hose 2, the discharge hose 9 and the return hose 40 are all connected to the metering tank 7, and the feed hose 2, the discharge hose 9 and the return hose 40 are all installed horizontally to prevent the pipeline from squeezing the metering tank 7 and affecting the metering accuracy. The discharge pneumatic valve 10 and the check pneumatic valve 15 are opened when there is a filling demand and closed when the filling is completed. The discharge pneumatic valve 10 prevents the material from entering the metering screw pump 11 due to gravity to form internal pressure, and the check pneumatic valve 15 prevents the residual pressure in the pipeline from entering the metering screw pump 11 to form an impact after the filling is completed. The delivery pressure sensor 13 is used for the system to monitor the outlet pressure of the metering screw pump 11 in real time to determine the delivery conditions, and the delivery pressure gauge 14 is used to observe the outlet pressure on site during maintenance for safe maintenance. The check valve 16 is a one-way design. The maintenance hand valve 17 is mainly used to manually cut off the material in the main pipeline. The main pipe pressure sensor 34 is mainly used to detect the pressure of the main pipeline during the filling process and the static process to provide whether the pressure is released in the static state. According to the principle, the bubble detector 35 provides a switch signal for the system. When there is air in the pipeline, the detector probe contacts the air, and the system alarms. The bubble detector 35 provides a switch signal for the system. When there is air in the pipeline, the detector probe contacts the air, and the system alarms. The conveying pipeline 18 is led from the outlet of the metering screw pump 11 to the filling pipeline. The pipeline is uphill all the way. The pipeline is 3-5° upward at the high point, so that the material can be filled from the low position to fill the entire conveying pipeline 18 during the debugging process to reduce the bubble rate and ensure the filling accuracy. The exhaust pipeline 36 is located at the end of the conveying pipeline 18 and the vertical height exceeds the conveying pipeline 180.5-1 meters, the exhaust pipe 36 forms the high position of the entire conveying pipe 18, so that the conveying pipe 18 can be kept filled during the conveying process, and trace bubbles gather on the exhaust pipe 36 to reduce the impact on the filling accuracy. The circulation valve 37 is located at the end of the exhaust pipe 36 to cut off the conveying pipeline to prevent materials from entering the circulation pipe 38 and affecting the filling accuracy. The reflux valve 39 is located at the end of the circulation pipe 38 before entering the metering tank 7 to prevent the material in the circulation pipe from dripping and affecting the filling accuracy. The circulation valve 37 is located at the end of the exhaust pipe 36 to cut off the conveying pipeline to prevent materials from entering the circulation pipe 38 and affecting the filling accuracy; the reflux valve 39 is located at the end of the circulation pipe 38 before entering the metering tank 7 to prevent the material in the circulation pipe from dripping and affecting the filling accuracy.

[0040] Furthermore, when the system needs to exhaust air, the discharge pneumatic valve 10, the check pneumatic valve 15, the circulation valve 37, and the reflux valve 39 are opened, and the material forms a closed loop through the metering tank 7 - screw pump 11 - conveying pipeline 18 - circulation pipe 38 - metering tank 7, so that the air in the conveying pipeline is exhausted.

[0041] like Figure 1 and Figure 5 As shown, preferably, the precision verification module IV400 includes a verification tee 19, a verification hand valve A20, a verification pneumatic valve A21, a verification pipeline 22, a verification pneumatic valve B23, a verification back pressure valve 24, and a verification hand valve B25. The verification tee 19 is installed with the tee port facing downward to facilitate the filling of the verification pipeline 22 with materials, and no high-level bubble gathering point is formed, thereby ensuring the filling accuracy. The verification hand valve A20 is used for the maintenance of the entire verification module without affecting other ports. The verification hand valve B25 is an end stop valve to prevent material spraying due to misoperation by personnel. The verification pneumatic valve A21 and the verification pneumatic valve B25 are connected to each other. 3 is a double pneumatic valve design that can effectively prevent pipeline vibration when filling at other ports. At the same time, the double pneumatic valve design can effectively reduce the risk of valve internal leakage. The back pressure valve 24 is pre-adjusted to a certain pressure of about 1 bar. When filling materials, it needs to exceed the pre-adjusted pressure before it can be opened for filling. The function of the back pressure valve 24 is to keep a certain pressure at the outlet during the filling process. The pipeline will not be directly emptied due to the weight of the material, so that the pipeline is always in a full pipe state. When the system stops filling, the back pressure valve 24 can also form a double protection to reduce the accuracy risk caused by valve internal leakage;

[0042] Furthermore, each filling system includes an accuracy verification module IV400. When the system needs to be tested for accuracy, accuracy verification can be achieved without disassembling the required equipment pipeline;

[0043] Furthermore, during the debugging process, the pressure of the back pressure valve 24 can be adjusted and checked online to ensure that the delivery pressure of each discharge port and filling port remains consistent during the filling process, thereby ensuring that the system delivery pressure is consistent and there will be no accuracy error caused by inconsistent delivery pressure.

[0044] like Figure 1 and Figure 6 As shown, preferably, the filling module V500 comprises a filling tee 26, a filling hand valve A27, a filling pneumatic valve A28, a filling pipeline 29, a filling pneumatic valve B30, a filling back pressure valve 31, a filling hose 32 and a demand device 33, one end of the filling pipeline 29 is connected to the delivery pipeline 18 by the filling tee 26, and the other end of the filling pipeline 29 is connected to the demand device 33 by the filling hose 32;

[0045] Furthermore, each filling system includes multiple filling modules V500, each module has the same configuration and is connected in parallel to the delivery pipeline 18; at the same time, the equipment functions on the filling module V500 are consistent with those of the accuracy verification module IV400, except that the terminal of the filling module V500 is connected to the demand equipment 33 by a filling hose 32.

[0046] like Figure 1 and Figure 6 As shown, preferably, the control module / software 600 is the control center of the entire system, providing action instructions and various error-proofing and fool-proofing logics, so that each device can coordinate actions to ensure that the system fills materials to the specified terminal at a specified weight and specified accuracy.

[0047] Working principle:

[0048] Example 1: Loading and pipe filling (exhausting) (taking vacuum loading as an example)

[0049] Insert the suction device into the raw material barrel. After the system obtains the loading information, it automatically opens the vacuum valve 4, and the metering tank pressure sensor 6 detects the pressure value in the metering tank 7 in real time.

[0050] When the pressure value in the metering tank 7 reaches the set upper limit value Pmax, the feed pneumatic valve 1 is opened and the material enters the metering tank 7; when the pressure value is lower than the set low pressure value Pmin and the material liquid level is lower than the high level Lmax, the feed pneumatic valve 1 is closed and the vacuum valve 4 is opened again, and the cycle is repeated until the material reaches the high liquid level Lmax.

[0051] Close the feed pneumatic valve 1 and open the pressure relief valve 5 to bring the metering tank 7 to a normal pressure state.

[0052] Open the discharging pneumatic valve 10, the check pneumatic valve 15, the circulation valve 37, the reflux valve 39, and check the pneumatic valve A 21, the filling pneumatic valve A 28 (and the remaining filling valves A).

[0053] The rotation speed of the servo motor 12 is manually set so that the screw pump 11 runs at a low rotation speed (<10% of the rated rotation speed).

[0054] The material is slowly transported to the conveying pipeline 18 through the screw pump 11; since the conveying pipeline 18 is in a climbing shape, the material will slowly fill the conveying pipeline 18 and the filling and calibration port pipelines from the low position in sequence; the gas in the pipeline is transported to the metering tank 7 through the circulation pipe 38 and then discharged by the pressure relief valve 5.

[0055] The material continues to rise slowly in the conveying pipe 18 , fills the exhaust pipe 36 , and flows back to the metering tank 7 through the circulation pipe 38 .

[0056] Turn off the servo motor 12, stop the screw pump 11, close the discharge pneumatic valve 10, the check pneumatic valve 15, and the circulation valve 37, and check the pneumatic valve A 21, the filling pneumatic valve A 28 (and the remaining filling valves A).

[0057] The reflux valve 39 is closed for a delayed period of time according to the actual situation, so that the material in the circulation pipe 38 can flow back to the metering tank 7 as much as possible, and then the reflux valve 39 is closed.

[0058] At this time, the exhaust of the delivery pipeline 18 and each filling port is completed.

[0059] Example 2: Accuracy Debugging

[0060] The system sets up automatic filling and filling volume steps, and different pump speeds are set for different steps; select the required equipment from far to near in the delivery pipeline for precision debugging one by one.

[0061] The system sets the filling volume according to the accuracy test requirements and starts by selecting the farthest required equipment (taking the 1# mixer in the figure as an example). The system automatically opens the valves including the pressure relief valve 5, the discharge pneumatic valve 10, the discharge pneumatic valve 15, the filling pneumatic valve A28, and the filling pneumatic valve A30. The servo motor 12 rotates at the specified speed, driving the metering screw pump 11 to rotate.

[0062] The material is transported by the metering screw pump 12. When a certain pressure is reached, the filling back pressure valve 31 (pre-adjusted pressure 1 bar) is opened and the material is transported to the high-precision calibration scale through the hose 32. The delivery pressure P0 at this time is recorded. After the first delivery of each machine, an exhaust action is performed; then the accuracy calibration begins.

[0063] According to the principle of starting from far to near, start debugging other machines (including the accuracy calibration port) and adjust the filling back pressure valve 31 to keep the delivery pressure P0 of each device consistent.

[0064] Example 3: Accuracy assurance measures and error prevention

[0065] The system uses a high-precision integrated floor scale and a high-precision floor scale with an instrument module (the weighing and display accuracy meet the specified requirements).

[0066] The inlet and outlet hoses of the metering tank 7 are installed horizontally to reduce the squeezing of the scale platform and eliminate external forces.

[0067] The circulation pipe 38 is designed to facilitate system debugging and daily exhaust of the system.

[0068] The delivery pipeline 18 is directed upwards without a concave pipeline, so that no air cavity is formed and exhaust is convenient.

[0069] The filling tee 26 is installed horizontally or downward to ensure that the air in the branch pipe can be quickly exhausted.

[0070] A high-level exhaust pipe 36 is provided to keep the delivery pipe 18 full at all times.

[0071] The filling port is designed with double pneumatic valves and back pressure valves, and triple leak-proof design to reduce the risk of internal leakage and ensure accuracy.

[0072] The servo motor is used to drive the screw pump for conveying, which has high speed controllability, quick shutdown, and can run at low speed for a long time to ensure the conveying accuracy.

[0073] The pipeline is equipped with a bubble detection function, which can promptly discharge bubbles in the pipe and ensure long-term stability of accuracy.

[0074] Set up end pressure detection. When the pipeline pressure is high under static conditions, it can automatically release the pressure to ensure safe transportation.

[0075] One-touch filling, simple and convenient operation.

[0076] In summary, the utility model comprises the hardware part of the system through the metering and storage module, the conveying power module, the conveying pipeline module, the precision verification module and the filling module, and coordinates the hardware to work according to the specified instructions through the control module / software, so as to realize the safe filling of materials into the specified equipment according to the specified weight and the specified precision, and the operation is simple. The utility model has the advantages of simple operation, safe use, high intelligence and high conveying precision control, and is suitable for the filling of lithium battery solvents in various working conditions: such as NMP, CNT, I SC-1, DT-1, DIW, BI-4, BD-3, SBR, L136D, etc., and is also suitable for filling systems with similar needs in other industries, which is very practical.

[0077] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision lithium battery solvent filling system, comprising a metering and storage module I (100), a delivery power module II (200), a delivery pipeline module III (300), an accuracy verification module IV (400), a filling module V (500) and a control module / software (600), characterized in that The metering and storage module I (100) comprises a metering tank (7) equipped with a metering tank level gauge (3), a vacuum valve (4), a pressure relief valve (5), a metering tank pressure sensor (6), and a high-precision floor scale (8) installed at the bottom thereof; The delivery power module II (200) comprises a metering screw pump (11) and a servo motor (12); The conveying pipeline module III (300) comprises a feed hose (2) equipped with a feed pneumatic valve (1), a discharge hose (9) equipped with a discharge pneumatic valve (10), a conveying pipeline (18) equipped with a conveying pressure sensor (13), a conveying pressure gauge (14), a check pneumatic valve (15), a check valve (16), and a maintenance manual valve (17), and a circulation pipeline (34) equipped with a main pressure sensor (35), a bubble detector (35), an exhaust pipeline (36), and a circulation valve (37). 8) and a reflux hose (40) equipped with a reflux valve (39), the feed hose (2) and the reflux hose (40) are respectively connected to the two sides of the top of the metering tank (7), the discharge hose (9) is connected between the bottom of the metering tank (7) and the top input end of the metering screw pump (11), the output end of one side of the metering screw pump (11) is fixedly connected to the conveying pipeline (18), and the conveying pipeline (18) and the circulation pipeline (38) and the reflux hose (40) are connected through each other; The precision verification module IV (400) comprises a verification tee (19), a verification hand valve A (20), a verification pneumatic valve A (21), a verification pipeline (22), a verification pneumatic valve B (23), a verification back pressure valve (24), and a verification hand valve B (25); The filling module V (500) comprises a filling tee (26), a filling manual valve A (27), a filling pneumatic valve A (28), a filling pipeline (29), a filling pneumatic valve B (30), a filling back pressure valve (31), a filling hose (32) and a demand device (33). One end of the filling pipeline (29) is connected to the delivery pipeline (18) by the filling tee (26), and the other end of the filling pipeline (29) is connected to the demand device (33) by the filling hose (32).

2. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The metering tank (7) is placed above a high-precision floor scale (8) and kept horizontal. The volume of the metering tank (7) is manufactured according to specified requirements, and its volume is often greater than the sum of the single filling amounts of all filling ports. The metering tank (7) can be any one of a normal pressure tank for pumping feeding or a negative pressure tank for vacuum loading as required.

3. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The high-precision floor scale (8) and the weighing meter connected and installed on one side are an integrated structure, which adapts the accuracy level of the weighing module according to actual needs, wherein the weighing module is integrated with the weighing platform of the high-precision floor scale (8) to achieve higher accuracy. The total range of the high-precision floor scale (8) is greater than the sum of the weight of the equipment installed on the metering tank (7) and the highest liquid level material. It is installed on a horizontal plane, and the accuracy of the scale itself is achieved by adjusting the level of the weighing platform. The weighing data of the high-precision floor scale (8) is read by the weighing meter and transmitted to the PLC to achieve accurate weighing of the material.

4. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The delivery flow of the metering screw pump (11) meets the maximum flow demand of the system. The core components are the stator and the rotor, which are made of EPDM and 316 materials respectively, and rotate without metal friction. The metering screw pump (11) is driven by the servo motor (12). The servo motor (12) can accurately control the rotation speed and has strong braking performance, and can quickly increase the metering screw pump (11) to achieve a specified delivery accuracy.

5. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The feed pneumatic valve (1) automatically switches on and off to replenish or stop replenishing liquid according to the liquid level of the material measured by the metering tank liquid level meter (3) in the metering tank (7).

6. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The three hoses, namely the feed hose (2), the discharge hose (9) and the return hose (40), are all connected to the metering tank (7), and the three hoses, namely the feed hose (2), the discharge hose (9) and the return hose (40), are all installed horizontally to prevent the pipeline from squeezing the metering tank (7) and affecting the metering accuracy.

7. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The discharge pneumatic valve (10) and the check pneumatic valve (15) are opened when there is a need for filling and closed when filling is completed. The discharge pneumatic valve (10) prevents the material from entering the metering screw pump (11) due to gravity to form internal pressure, and the check pneumatic valve (15) prevents the residual pressure in the pipeline from entering the metering screw pump (11) to form an impact after filling is completed.

8. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The delivery pressure sensor (13) is used for real-time monitoring of the outlet pressure of the metering screw pump (11) by the system to determine the delivery conditions, and the delivery pressure gauge (14) is used for on-site observation of the outlet pressure during maintenance to facilitate safe maintenance. The check valve (16) is a one-way design. The maintenance hand valve (17) is mainly used to manually cut off the material in the main pipeline. The main pipeline pressure sensor (34) is mainly used to detect the pressure of the main pipeline during the filling process and the static process to provide a basis for whether to release the pressure under static conditions. The bubble detector (35) provides a switch signal for the system. When there is air in the pipeline, the detector probe contacts the air and the system alarms. The bubble detector (35) provides a switch signal for the system. When there is air in the pipeline, the detector probe contacts the air and the system alarms.

9. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The conveying pipeline (18) is led out from the outlet of the metering screw pump (11) to the filling pipeline. The pipeline is in an uphill shape throughout the pipeline. The pipeline is inclined upward at a 3-5° angle at a high point, so that during the debugging process, the material can be filled from a low position to fill the entire conveying pipeline (18) to reduce the bubble rate and ensure the filling accuracy. The exhaust pipeline (36) is located at the end of the conveying pipeline (18) and its vertical height exceeds the conveying pipeline (18) by 0.5-1 meter. The exhaust pipeline (36) forms the high position of the entire conveying pipeline (18), so that the conveying pipeline (18) can remain filled during the conveying process, and trace bubbles gather on the exhaust pipeline (36) to reduce the impact on the filling accuracy.

10. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The circulation valve (37) is located at the end of the exhaust pipe (36) to cut off the conveying pipeline, preventing materials from entering the circulation pipe (38) and affecting the filling accuracy; the reflux valve (39) is located at the end of the circulation pipe (38) before entering the metering tank (7) to prevent materials in the circulation pipe (38) from dripping and affecting the filling accuracy. The circulation valve (37) is located at the end of the exhaust pipe (36) to cut off the conveying pipeline, preventing materials from entering the circulation pipe (38) and affecting the filling accuracy; the reflux valve (39) is located at the end of the circulation pipe (38) before entering the metering tank (7) to prevent materials in the circulation pipe from dripping and affecting the filling accuracy.

11. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The three-way port of the calibration tee (19) is installed downward to facilitate the filling of the calibration pipe (22) with materials, and no high-level bubble gathering point is formed, thereby ensuring the filling accuracy. The calibration hand valve A (20) is used for the maintenance of the entire calibration module without affecting other ports. The calibration hand valve B (25) is an end stop valve to prevent material spraying due to misoperation by personnel. The calibration pneumatic valve A (21) and the calibration pneumatic valve B (23) are double pneumatic valve designs that can effectively prevent pipeline vibration when filling at other ports. At the same time, the double pneumatic valve design can effectively reduce the risk of valve internal leakage. The calibration back pressure valve (24) is pre-adjusted to a certain pressure of about 1 bar. When filling materials, it needs to exceed the pre-adjusted pressure before it can be opened for filling. The function of the calibration back pressure valve (24) is to keep a certain pressure at the outlet end during the filling process, so that the pipeline will not be directly emptied due to the weight of the material, so that the pipeline is always in a full pipe state. When the system stops filling, the calibration back pressure valve (24) can also form a double protection to reduce the accuracy risk caused by valve internal leakage.

12. A high-precision lithium battery solvent filling system according to claim 1, characterized in that: The control module / software (600) is the control center of the entire system, providing action instructions and various error-proofing and fool-proofing logics to coordinate the actions of various devices to ensure that the system fills materials to the designated terminal at a designated weight and with a designated accuracy.

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