Automatic control system for washing and separating ternary lithium-ion battery precursors and method of using the same

Abstract

The application provides a kind of automatic control system of washing and separating of ternary lithium ion battery precursor, comprising: washing and separating device, including filter press, slurry port, conveying port, discharge port, squeezing port and back flushing port are equipped on the filter press;Valve station device, including pipeline connected with the above-mentioned material port and control valve arranged thereon;Conveying device, one end is arranged below the discharge port;Controller, connected with filter press, each control valve and conveying device, and according to the preset program control the opening and closing of filter press, control valve and conveying device, to realize the process of liquid inlet, squeezing, back flushing, flushing, discharge filtrate, blow dry, conveying finished product. The above-mentioned system is used to realize the automatic washing and separation of precursor, and the quality of precursor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium ion battery preparation, and more particularly to an automatic control system for washing and separating ternary lithium ion battery precursors and a use method thereof. BACKGROUND

[0002] High-nickel ternary positive electrode materials have the advantages of high capacity, good thermal stability, low price, etc., can be widely used in small lithium batteries and lithium ion power batteries, are a product very close to lithium cobaltate, and have a much higher performance-price ratio than lithium cobaltate. The development prospect of high-nickel ternary positive electrode materials is very broad.

[0003] In the prior art, for batch production of ternary lithium battery precursors according to orders, different types of ternary products (such as 523, 622, and 811) need an operator to control different operation steps and set different parameters on site, and the operator needs to intervene manually. In addition, the operation is complicated, and multiple sets of equipment such as washing and separating devices, conveying devices, and feeding pumps need to be managed at the same time. Therefore, the operator has a heavy workload, the product indicators prepared are unstable, and the waste rate is high.

[0004] In addition, the wet material is transported by an artificial trolley or a crane in batches, and in the process of washing and separating, the wet material is easily in contact with external pollutants, which pollutes the wet material, making it difficult to meet the use of high-nickel precursors. In addition, the artificial transportation of wet material is prone to cause micro-damage to the spherical material. SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide an automatic control system for washing and separating ternary lithium ion battery precursors and a use method thereof.

[0006] According to one aspect of the present application, an automatic control system for washing and separating ternary lithium ion battery precursors is provided, comprising:

[0007] a washing and separating device, comprising a filter press, wherein a slurry port, a conveying port, a discharge port, a pressing port, and a back blowing port are arranged on the filter press;

[0008] a valve station device, comprising: a slurry pipeline connected to the slurry port, wherein a slurry control valve is arranged on the slurry pipeline; a pressing gas pipeline connected to the pressing port, wherein a pressing gas control valve and a gas release valve are arranged on the pressing gas pipeline; a dry blowing gas pipeline connected to the conveying port, wherein a dry blowing gas control valve is arranged on the dry blowing gas pipeline; a flushing water pipeline connected to the slurry port and the conveying port, wherein a flushing water control valve is arranged on the flushing water pipeline; a back blowing pipeline connected to the back blowing port, wherein a back blowing control valve is arranged on the back blowing pipeline; and a filtrate pipeline connected to the conveying port, wherein a filtrate control valve is arranged on the filtrate pipeline;

[0009] a conveying device, one end of which is arranged below the discharge port;

[0010] A controller is connected with the filter press, the control valves and the conveying device, and controls the opening and closing of the filter press, the control valves and the conveying device according to a preset program to realize the processes of liquid feeding, pressing, back flushing, washing, filtrate discharging, blowing dry and product conveying.

[0011] In addition, preferably, the system further comprises a backflow pipeline connected with the slurry outlet, and a slurry backflow control valve is arranged on the backflow pipeline.

[0012] In addition, preferably, the conveying outlet comprises a left lower discharging outlet, a right lower discharging outlet, a left upper feeding outlet and a right upper feeding outlet, and a control valve is arranged on each of the outlets.

[0013] In addition, preferably, the system further comprises a pressure control valve arranged on the air release valve pipeline and connected with the air release valve, and a center washing control valve arranged on the slurry pipeline and connected with the slurry outlet.

[0014] In addition, preferably, the filtrate control valve comprises a turbid liquid control valve, a mother liquor control valve and a washing liquid control valve arranged in parallel.

[0015] According to another aspect of the present application, a use method of the automatic control system for washing and separating of a ternary lithium ion battery precursor is provided, which comprises the following steps:

[0016] S1, the filter press is compressed and the slurry control valve is opened to make the slurry enter the filter press of the washing and separating device;

[0017] S2, the pressing air control valve is opened to make the pressing air enter the filter press, and the slurry in the filter press is pressed;

[0018] S3, the back flushing control valve is opened to clean the residual liquid in the slurry pipeline;

[0019] S4, the washing water control valve is opened to make the washing water enter the washing and separating device to soak and wash the filter cake, and the filtrate control valve is opened to discharge the washing water;

[0020] S5, the filter press is controlled to further press the filter cake, and the filtrate is discharged;

[0021] S6, the back flushing control valve is opened again to clean the residual liquid in the slurry pipeline;

[0022] S7, the blowing dry air control valve is opened to blow air into the filter press to reduce the water content of the filter cake;

[0023] S8, the back flushing control valve is opened again to clean the residual liquid in the slurry pipeline;

[0024] S9, the air release valve is opened to empty the pressing air, and the filter press is opened to unload the filter cake to the conveying device for conveying.

[0025] Further, preferably, the process of filling the slurry into the filter chamber in S1 comprises a first stage of filling, a second stage of filling and a third stage of filling, wherein

[0026] The first stage of filling is a preliminary cake hanging stage, the second stage of filling makes the filter cake uniform, and the third stage of filling makes the filter chamber full of slurry.

[0027] Further, preferably, the process of filling the press gas into the filter press in S2 comprises a pre-pressing gas filling, a pre-pressing pressure adjusting and a pre-pressing pressure maintaining, wherein

[0028] The pre-pressing gas filling compacts the filter cake, and the pre-pressing pressure adjusting and the pre-pressing pressure maintaining discharge the liquid in the filter chamber.

[0029] Further, preferably, the washing process of the washing water in S4 comprises a slurry port washing and a delivery port washing.

[0030] Through the above description, the washing and separation automatic control system of the ternary lithium ion battery precursor mentioned in the application can automatically control the slurry, cleaning and delivery of wet materials. By simultaneously controlling the control valve, the washing and separation device and the delivery device through the controller, the entire process forms a standardized product, which is more conducive to the large-scale application and production organization and management of high-quality ternary projects.

[0031] The use method of the washing and separation automatic control system of the ternary lithium ion battery precursor mentioned in the application can efficiently separate the wet materials, standardize the operation process, and improve the preparation quality of the precursor.

[0032] To the accomplishment of the foregoing and related ends, one or more aspects of the application, as generally described herein, include the features recited in the claims below and as pointed out in the detailed description. The foregoing and the following detailed description and specific examples, which explain various aspects of the application, will provide further appreciation and a better understanding of the application. The application is described and explained with additional specificity and detail through the use of the accompanying drawings in which: BRIEF DESCRIPTION OF DRAWINGS

[0033] The application can be more fully understood from the following detailed description taken in connection with the accompanying drawings, together with the above general description of the application. In the drawings:

[0034] Figure 1 The structure of the washing and separation automatic control system of the ternary lithium ion battery precursor of the application is shown;

[0035] Figure 2 The flow of the use method of the washing and separation automatic control system of the ternary lithium ion battery precursor of the application is shown.

[0036] REFERENCE NUMERALS

[0037] 1, slurry port; 2, left lower discharge port; 3, right lower discharge port; 4, left upper feed port; 5, right upper feed port; 6, pressing port; 7, back flushing port; 8, conveying device; 11, center washing control valve; 12, left lower control valve; 13, right lower control valve; 14, left upper control valve; 15, right upper control valve; 16, pressing gas control valve; 17, back flushing control valve; 18, turbid liquid control valve; 19, mother liquor control valve; 20, washing liquid control valve; 21, slurry control valve; 22, slurry backflow control valve; 23, air release valve; 24, pressure control valve; 25, left side control valve; 26, right side control valve; 27, flushing water control valve; 28, dry blowing gas control valve.

[0038] The same reference numbers in all the figures indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0040] Figure 1 The structure diagram of the automatic control system for washing and separating of the ternary lithium ion battery precursor.

[0041] As shown in Figure 1 the automatic control system for washing and separating of the ternary lithium ion battery precursor of the present application, comprising: a washing and separating device, a valve station device, a conveying device and a controller. Among them, the controller is electrically connected with the control valve provided on the pipeline in the valve station device, the filter press and the conveying device 8.

[0042] The washing and separating device includes a filter press, which is provided with a slurry port 1, a conveying port, a discharge port, a pressing port and a back flushing port. The valve station device includes: a slurry pipeline connected with the slurry port 1, which is provided with a slurry control valve 21; a pressing gas pipeline connected with the pressing port 6, which is provided with a pressing gas control valve 16 and an air release valve 23; a dry blowing gas pipeline connected with the conveying port, which is provided with a dry blowing gas control valve 28; a flushing water pipeline connected with the slurry port 1 and the conveying port, which is provided with a flushing water control valve 27; a back flushing pipeline connected with the back flushing port 7, which is provided with a back flushing control valve 17; a filtrate pipeline connected with the conveying port, which is provided with a filtrate control valve. The conveying device 8 is provided at one end below the discharge port;

[0043] The controller is connected with the filter press, each control valve and the conveying device, and controls the opening and closing of the filter press, the control valve and the conveying device according to the preset program, so as to realize the process of liquid inlet, pressing, back flushing, flushing, filtrate discharge, dry blowing and conveying of finished products.

[0044] In use, the squeezing slurry enters the washing and separating device through the pipeline, the washing and separating device processes the slurry according to the preset program under the instruction of the controller, the solid obtained after the slurry is subjected to solid-liquid separation is the precursor, and the precursor is conveyed to a designated position through the conveying device, so that the automatic washing and separating of the precursor is realized, human intervention is reduced, the working efficiency is improved, and the quality of the precursor is improved.

[0045] The washing and separating automatic control system of the ternary lithium ion battery precursor further comprises a backflow pipeline connected with the slurry port 1, and a slurry backflow control valve 22 is arranged on the backflow pipeline. In detail, the slurry backflow control valve 22 is arranged between the slurry control valve 21 and the slurry port 1, so as to collect the backflow slurry in the pipeline and reduce the waste of materials.

[0046] The filtrate control valve comprises the turbid liquid control valve 18, the mother liquor control valve 19 and the washing liquid control valve 20 arranged in parallel, and in detail, the turbid liquid control valve 18 is connected with the turbid liquid collecting device, the mother liquor control valve 19 is connected with the mother liquor collecting device, and the washing liquid control valve 20 is connected with the washing liquid collecting device. During use of the washing and separating device, it is necessary to input flushing water to flush the slurry, and after flushing, the liquid needs to be discharged from the washing and separating device. At this time, the controller controls the opening and closing of the state of the turbid liquid control valve 18, the mother liquor control valve 19 and the washing liquid control valve 20, so as to discharge the turbid liquid, the mother liquor and the washing liquid from the washing and separating device, and ensure the normal operation of the washing and separating device.

[0047] The conveying port arranged on the cover body comprises a left lower discharging port 2, a right lower discharging port 3, a left upper feeding port 4 and a right upper feeding port 5, and control valves are arranged on the respective ports, and in detail, a left lower control valve 12 is arranged on the left lower discharging port 2, a right lower control valve 13 is arranged on the right lower discharging port 3, a left upper control valve 14 is arranged on the left upper feeding port 4, and a right upper control valve 15 is arranged on the right upper feeding port 5. The conveying port is divided into multiple ports, so as to facilitate cleaning, blow-drying and squeezing operations.

[0048] More specifically, a left side control valve 25 is arranged on the joint of the pipelines where the left lower control valve 12 and the left upper control valve 14 are arranged, and a right side control valve 26 is arranged on the joint of the pipelines where the right lower control valve 13 and the right upper control valve 15 are arranged. The left side control valve 25 and the right side control valve 26 are respectively communicated with the turbid liquid control valve 18, the mother liquor control valve 19 and the washing liquid control valve 20, so as to facilitate the discharge of the waste filtrate in the ports on the left side or the right side from the filter press, and simplify the operation steps.

[0049] The automatic control system for the ternary lithium ion battery precursor washing and separation further comprises a pressure control valve 24 arranged on a pipeline where the air release valve 23 is arranged and connected with the air release valve 23, and the pressure control valve 24 releases the gas pressure in the filter press according to the preset program of the controller to achieve a better washing and separation effect; the center washing control valve 11 is arranged on the slurry pipeline and connected with the slurry port 1, and the slurry port 1 can be cleaned when the wet material is washed and separated, so that the washing and separation quality of the slurry of the next feeding is not affected by the slurry residues of this feeding, and the preparation quality of the precursor of the system is further improved.

[0050] In the present application, the control valve is a pneumatic ball valve, which can quickly switch the state of the switch according to the step instructions of the controller, and has high sealing level. The slurry pipeline, the pressing gas pipeline, the blow-drying gas pipeline, the flushing water pipeline, the back flushing pipeline, the filtrate pipeline, and the filter press for transporting the slurry raw material, the flushing water and the gas required for flushing the slurry raw material into the filter press of the washing and separation device, the above-mentioned pipelines and the control valves arranged thereon form an integrated valve station system, and the controller switches the opening and closing state of the control valves in the integrated valve station system according to the preset steps to realize the automatic washing and separation of the slurry.

[0051] Further, the flushing water control valve 27 comprises a left flushing water control valve and a right flushing water control valve, the left flushing water control valve is connected with the left control valve 25, and the right flushing water control valve is connected with the right control valve 26, so that the control of the whole system for the delivery of the flushing water is more accurate.

[0052] It should be noted that the above-mentioned slurry pipeline, pressing gas pipeline, blow-drying gas pipeline and flushing water pipeline have partially overlapped pipelines in the pipeline design, and therefore the functions of the overlapped pipelines are different in different washing and separation stages, that is, the actual delivery function is used as the criterion.

[0053] In the present application, the end of one side of the conveying device 8 is arranged below the discharge port of the washing and separation device, and the precursor after solid-liquid separation falls onto the conveying device 8 and is conveyed to a designated position by the conveying device 8.

[0054] The controller is a DCS control system or a PLC control system, and the above-mentioned system has high stability and strong anti-interference advantage. In the whole system, the controller controls a plurality of control valves, the washing and separation device and the conveying device 8 synchronously according to the preset program, the controller sends program instructions to the above-mentioned devices, the above-mentioned devices perform corresponding operations after receiving the instructions and feed back real-time signals to the controller. In detail, the controller receives the feedback signals of the control valves, the controller receives the state signals of the filter press, the controller receives the frequency conversion signals of the conveying device 8, and the controller distinguishes the signals between different devices, so that the subsequent regulation and control of the system is more accurate, and the quality of the precursor washing and separation is further improved.

[0055] The conveying device 8 is a screw conveyor or a conveying belt, and the starting point of the conveying device 8 is arranged at the position of the discharge port of the washing and separating device 2, for conveying the precursor after washing and separation to a designated position.

[0056] The system further comprises a monitoring program arranged in the controller, and the current running step state, step timing, step duration, and the running state of the control valve and equipment involved in each step can be displayed on the display screen of the controller; wherein the step buttons of one-key process starting, pausing, stepping and emergency stopping are included on the operation picture, and can be used for manual intervention to control the washing and separating process. In addition, the setting parameters of all steps are opened on the operation station of the controller, including the pulp feeding time, pre-pressing pressure, flushing water amount, press air pressure, etc., so as to facilitate the editing of the washing and separating process of the system and the monitoring of the running state of the system.

[0057] Figure 2 The flow chart of the use method of the automatic control system for washing and separating of the ternary lithium ion battery precursor.

[0058] According to another aspect of the present application, a use method of an automatic control system for washing and separating of a ternary lithium ion battery precursor is provided, which adopts the automatic control system for washing and separating of a ternary lithium ion battery precursor as described above to perform washing and separating operation, specifically, the following operations are performed by the controller as described above:

[0059] S1, the filter press is compressed and the pulp control valve 21 is opened to make the pulp enter the filter press of the washing and separating device;

[0060] S2, the press air control valve 16 is opened to make the press air enter the filter press, and the pulp in the filter press is pressed;

[0061] S3, the blowback control valve 17 is opened to clean the residual liquid in the pulp pipeline;

[0062] S4, the flushing water control valve 27 is opened to make the flushing water enter the washing and separating device to soak and wash the filter cake, and the filtrate control valve is opened to discharge the flushing water;

[0063] S5, the filter press is controlled to further press the filter cake, and the filtrate is discharged;

[0064] S6, the blowback control valve 17 is opened again to clean the residual liquid in the pulp pipeline;

[0065] S7, the blow-drying gas control valve 28 is opened to blow gas into the filter press to reduce the water content of the filter cake;

[0066] S8, the blowback control valve 17 is opened again to clean the residual liquid in the pulp pipeline;

[0067] S9, the air release valve 23 is opened to empty the press air, and the filter press is opened again to unload the filter cake to the conveying device for conveying.

[0068] Further, the process of filling the slurry into the filter chamber in S1 includes three stages: the first stage of filling the slurry, the second stage of filling the slurry, and the third stage of filling the slurry, wherein the first stage of filling the slurry is a preliminary cake hanging stage, the second stage of filling the slurry makes the filter cake uniform, and the third stage of filling the slurry fills the filter chamber with the slurry.

[0069] Further, the process of entering the press air into the filter press in S2 includes pre-pressing air entering, pre-pressing pressure adjusting, and pre-pressing pressure maintaining, wherein the pre-pressing air entering compacts the filter cake, and the pre-pressing pressure adjusting and the pre-pressing pressure maintaining discharge the liquid in the filter chamber.

[0070] Further, the washing process of the washing water in S4 includes slurry port washing and delivery port washing.

[0071] Further, the system needs to determine that the pressure signal of the filter press in the washing and separating device and the liquid level signal of the slurry storage tank supplying the washing and separating device meet the preset standard before use, and then the slurry starts to enter the washing and separating device. The pressure signal indicates that the filter press is in a compacted state and the slurry control valve 21 can be opened for feeding, and the liquid level signal indicates that the slurry meets the one-time washing and separating of the washing and separating device. The above two conditions are met, that is, the device can start to run.

[0072] In the whole system, the controller synchronously controls a plurality of control valves, the washing and separating device, and the conveying device 8 according to the preset step program. The controller sends the step program instructions to the above-mentioned devices, and the above-mentioned devices perform corresponding operations after receiving the step instructions and feed back real-time signals to the controller. In detail, the controller receives the feedback signals of the control valves, the controller receives the state signals of the filter press, and the controller receives the frequency conversion signals of the conveying device 8. The controller distinguishes the signals between different devices, so that the subsequent regulation and control of the system are more accurate, and the quality of the precursor washing and separating is further improved.

[0073] Further, the steps of the controller controlling the filter press include: the first stage of filling the slurry, the second stage of filling the slurry, the third stage of filling the slurry, pre-pressing air entering, pre-pressing pressure adjusting, pre-pressing pressure maintaining, air backwashing one, center washing, left side washing, right side washing, left side soaking washing, right side soaking washing, pressing, air backwashing two, air side blowing, air backwashing three, pressing air release, unloading, and conveying. Through the above steps, the wet material is washed and solid-liquid separated to obtain relatively pure and dry precursor material.

[0074] Specifically, the instructions of the controller are: first opening the slurry control valve 21, second opening the slurry control valve 21, third opening the slurry control valve 21, first opening the pressing gas control valve 16, opening the air release valve 23, pre-pressing pressure maintaining, first opening the back blowing control valve 17, opening the center washing control valve 11, opening the left side control valve 25 and the left upper control valve 14 and the left lower control valve 12, opening the right side control valve 26 and the right upper control valve 15 and the right lower control valve 13, left side soaking washing, right side soaking washing, pressing, second opening the back blowing control valve, opening the hole side blowing control valve 28, third opening the back blowing control valve 17, opening the air release valve 23, unloading, conveying.

[0075] The automatic control system for washing and separating of ternary lithium battery precursors and the use method thereof will be described in detail below through more specific embodiments.

[0076] In the automatic control system for washing and separating of ternary lithium battery precursors, the control valve is a pneumatic ball valve, the filter press is a plate and frame filter press, and the conveying device 8 is a double screw conveyor. The system is integrated with the valve station device, the plate and frame filter press as the main body of the ternary lithium battery precursor washing and separating device, and the unloading double screw conveyor, so that the washing and separating process of the ternary lithium ion battery positive electrode precursor can be edited and monitored, and the automatic control system for washing and separating of ternary lithium ion battery positive electrode precursors is realized without supervision and automatic control.

[0077] The valve station device adopts a pneumatic ball valve, which is integrated and configured, and the gas supply in the control valve adopts a gas source distributor, which is convenient for on-site construction and management.

[0078] The sequence of the preset steps on the DCS control system controls the opening and closing sequence of the control valves in the integrated valve station device, the feeding and unloading work of the filter press, and the start and stop of the screw filter press, so as to realize full-process automation.

[0079] In detail, the steps of the DCS control system for controlling the filter press include: first-stage slurry feeding, second-stage slurry feeding, third-stage slurry feeding, pre-pressing air feeding, pre-pressing pressure adjusting, pre-pressing pressure maintaining, air back blowing one, center washing, left side washing, right side washing, left side soaking washing, right side soaking washing, pressing, air back blowing two, air side blowing, air back blowing three, pressing air release, unloading, and conveying.

[0080] Each step opening has corresponding parameters or device actions as the starting point, and on-site instrument signals, time, cumulative values and other parameters as the step end point. In this embodiment, the pressure detection signal of the pressure sensor on the pipeline of the slurry port 1, the time detected on the DCS control system, the flow cumulative value and other parameters are used as the step end point. The steps will be described in detail below.

[0081] First stage of pulp feeding: open the pulp feeding control valve, and open the control valves (including: left lower control valve 12, right lower control valve 13, left upper control valve 14, right upper control valve 15, left side control valve 25 and right side control valve 26) through which the pulp flows, at the same time, open the turbid liquid control valve 18 and the pressure control valve (100% open) 24, this step is the initial cake hanging stage, at this time, the filter chamber of the filter press is not full, and the filtrate may have a running mixture phenomenon, wait for the pressure tested on the pressure sensor to reach the set value (the set value is marked in the controller adjustment), the first stage of pulp feeding is completed, and the above-mentioned control valves are closed.

[0082] Second stage of pulp feeding: open the pulp feeding control valve, and open the control valves (including: left upper control valve 14, right upper control valve 15, left side control valve 25 and right side control valve 26) through which the pulp flows, which are arranged on the upper part of the washing and separating device, at the same time, open the mother liquor control valve 19 and the pressure control valve 24 (100% open), at this time, the filter cloth has a little filter cake hanging on it, and normal filtration can be carried out, in order to arrange the filter cake uniformly, only the upper liquid is discharged, wait for the pressure tested on the pressure sensor to reach the set value (the set value is marked in the controller adjustment), the second stage of pulp feeding is completed, and the above-mentioned control valves are closed.

[0083] Third stage of pulp feeding: open the pulp feeding control valve, and open the left lower control valve 12, the right lower control valve 13, the left upper control valve 14, the right upper control valve 15, the left side control valve 25 and the right side control valve 26, at the same time, open the mother liquor control valve 19 and the pressure control valve 24 (100% open), at this time, the filter chamber is initially full, and the liquid is discharged from the four corners at the same time to ensure that the filter chamber is completely full of solid material, wait for the pressure tested on the pressure sensor to reach the set value (the set value is marked in the controller adjustment), the third stage of pulp feeding is completed, and the above-mentioned control valves are closed.

[0084] Pre-pressing air feeding: open the left lower control valve 12, the right lower control valve 13, the left upper control valve 14, the right upper control valve 15, the left side control valve 25 and the right side control valve 26, at the same time, open the mother liquor control valve 19 and the press air control valve 16, at this time, the diaphragm is initially pressurized, the filter cake is compacted, and the diaphragm continues to maintain pressure in the subsequent washing process, the pre-pressing air feeding is completed, and the above-mentioned control valves are closed.

[0085] Pre-pressing pressure adjustment: open the air release valve 23 in advance, then open the left lower control valve 12, the right lower control valve 13, the left upper control valve 14, the right upper control valve 15, the left side control valve 25 and the right side control valve 26, open the mother liquor control valve 19, at the same time, slowly adjust the pressure control valve 24 upward for about 10s, at this time, the system is adjusted according to the set value in the controller, until the actual pressure value of the pre-pressing reaches the set value, after completing the step, the above-mentioned control valves are closed.

[0086] Pre-pressing holding: open the left lower control valve 12, the right lower control valve 13, the left upper control valve 14, the right upper control valve 15, the left side control valve 25 and the right side control valve 26, and open the mother liquor control valve 19, at this time, the pre-pressing holding time is required, after the step is completed, the above-mentioned control valves are closed.

[0087] Air backwashing I: open the slurry backflow control valve 22 and the backwashing control valve 17, and blow the pipeline residual liquid of the slurry port 1 in the filtering stage, after the step is completed, the above-mentioned control valves are closed.

[0088] Center washing: open the center washing control valve 11, the left upper control valve 14, the right upper control valve 15, the left side control valve 25, the right side control valve 26 and the washing liquid control valve 20, the slurry port 1 enters pure water, and the upper part discharges washing liquid to ensure that the filter cake is fully soaked and washed, at this time, the flow value of the washing liquid is measured, after the step is completed, the above-mentioned control valves are closed.

[0089] Left side washing: open the pure water left side control valve, the left upper control valve 14, the left lower control valve 12, the right upper control valve 15, the right side control valve 26 and the washing liquid control valve 20, prevent the washing water channel from short-circuiting, the left side enters washing water, and the right side discharges washing liquid, after the step is completed, the above-mentioned control valves are closed.

[0090] Right side washing: open the pure water right side control valve, the left upper control valve 14, the right upper control valve 15, the right lower control valve 13, the left side control valve 25 and the washing liquid control valve 20, prevent the washing water channel from short-circuiting, the right side enters washing water, and the left side discharges washing liquid, after the step is completed, the above-mentioned control valves are closed.

[0091] Left side soaking washing: open the pure water left side control valve, the left upper control valve 14, the left lower control valve 12, the right upper control valve 15, the right side control valve 26 and the washing liquid control valve 20, the left side enters pure water, and the right side upper part discharges washing liquid to ensure that the filter cake is fully soaked and washed, after the step is completed, the above-mentioned control valves are closed.

[0092] Right side soaking washing: open the pure water right side control valve, the left upper control valve 14, the right upper control valve 15, the right lower control valve 13, the left side control valve 25 and the washing liquid control valve 20, the right side enters pure water, and the left side upper part discharges washing liquid to ensure that the filter cake is fully soaked and washed, after the step is completed, the above-mentioned control valves are closed.

[0093] Pressing: open the left lower control valve 12, the right lower control valve 13, the left upper control valve 14, the right upper control valve 15, the left side control valve 25 and the right side control valve 26, at the same time, open the washing liquid control valve 20, wait for the pressing time to arrive, make the diaphragm press under the maximum pressure, compact the filter cake, and fully squeeze out the moisture, after the step is completed, the above-mentioned control valves are closed.

[0094] Air back flush two: open slurry back flow control valve 22 and back flush control valve 17, blow clean the residual slurry in the pipeline of slurry inlet 1 in filtration stage, after the completion of the step, the above-mentioned control valves are closed.

[0095] Air side flush: open slurry back flow control valve 22, left lower control valve 12, right lower control valve 13, left upper control valve 14, right upper control valve 15 and dry air control valve 28, according to the preset time in the controller, side sleep, side air inlet fully flush the filter cake, reduce the moisture content of the filter cake, make the material loose, after the completion of the step, the above-mentioned control valves are closed.

[0096] Air back flush three: open slurry back flow control valve 22 and back flush control valve 17, blow clean the residual slurry in the pipeline of slurry inlet 1 in washing and pressing stage, create conditions for starting unloading cake, after the completion of the step, the above-mentioned control valves are closed.

[0097] Pressing air release: open pressure control valve (100% open) 24 and air release valve 23, create conditions for starting unloading cake, after the completion of the step, the above-mentioned equipment are closed, and the pressure is not greater than 0.1 to allow discharging.

[0098] Discharge and transport: after the completion of washing and separation, the relatively pure and dry precursor material obtained is discharged, the precursor material falls on the conveying belt of the conveying device 8 at the outlet of the filter press, and is transported to the designated position through the conveying device.

[0099] Through the system, the whole solid-liquid separation operation of the wet material is completed, and the relatively dry precursor material is finally obtained.

[0100] When the pressing signal and the liquid level signal in the washing and separation automatic control system of the ternary lithium battery precursor meet the set conditions, the control valve can be opened to start feeding slurry into the washing and separation device, the amount of feeding slurry is controlled according to the feeding pressure of the filter press, and when the feeding slurry is completed, the air pressure of the pressing is adjusted to the set pressure through the pressing air control valve 16. The pressing needs to meet the set requirements, that is, the pre-pressing pressure maintaining stage is entered, and the pressure maintaining time can be set. When the pressure maintaining time is up, air back flushing is performed, and the back flushing time can be set. After the back flushing is completed, the washing stage is entered, and the system is designed to have five times of washing. The end point of each washing can be set through the cumulative value of the washing water delivery pump outlet flowmeter, or some steps can be skipped according to the requirements of different types of ternary precursors. After the washing is completed, the pressing stage is entered, and the pressing time can be set according to requirements. After the pressing is completed, the air back flushing, side flushing and other steps are entered, and the time can be set. After the back flushing is completed, the air release is started, the air release valve 23 is opened, all other control valves are closed, and the discharging signal is sent to the filter press and the conveying device. After receiving the running signal of the conveying device, the filter press starts discharging, and the whole washing and separation process is completed.

[0101] The operation station of the DCS control system is also provided with a washing and separating process table and an operation interface on the display screen of the open controller, so that the operator can set steps and parameters for different series of products to realize editing of the washing and separating process. The current step state, step timing, step duration, and the running state of the valves and equipment involved in each step can be monitored on the pop-up screen of the display screen of the controller, and one-key process opening, pause, step skipping, and emergency stop buttons are opened on the operation screen to cope with on-site emergencies and to allow human intervention.

[0102] The automatic control system of the process-editable washing and separating device for the precursor of the positive electrode of the ternary lithium ion battery of the application is based on DCS sequential control, an integrated valve station system, and a plate-and-frame filter press as the main body of the ternary lithium battery precursor washing and separating device, and a discharging double-screw conveyor, to realize a special washing and separating system integrating filtering, aging, washing, blow-drying, and conveying of the positive electrode precursor of the ternary lithium ion battery.

[0103] The automatic control system of the process-editable washing and separating device for the precursor of the positive electrode of the ternary lithium ion battery of the application and the use method thereof can be used to meet the wet material processing of different models of high-end ternary precursors, the parameters and steps can be set arbitrarily according to the requirements, the pulp feeding, pressing, washing, blow-drying, and conveying processes can be edited and monitored, human intervention is reduced, unattended supervision and automatic control are realized, and at the same time, the ternary lithium battery precursor has stable material properties, low moisture content, and no foreign matter pollution.

[0104] By setting control valves with different functions corresponding to the washing and separating steps of the filter press, efficient and rapid cleaning and separation are achieved, and to obtain better quality precursor materials, the washing and separating steps of the filter press are differentiated in detail, and the DCS control system is used to realize automatic washing and separating without human intervention.

[0105] The system reduces human intervention, reduces labor costs and labor load, has high fault tolerance, good product consistency, stable indicators, and is conducive to the production of high-end ternary products. The automatic control mode reduces the risk of contact between the wet material and external pollutants during the washing and separating process, meets the use of high-nickel precursors, and ensures that the spherical material of the wet material is not micro-damaged during the washing and separating process.

[0106] As described above with reference to Figure 1 The automatic control system of the washing and separating of the ternary lithium ion battery precursor according to the application and the use method thereof are described by way of example. However, those skilled in the art should understand that various improvements can be made to the automatic control system of the washing and separating of the ternary lithium ion battery precursor according to the application and the use method thereof described above without departing from the content of the application. Therefore, the protection scope of the application should be determined by the content of the appended claims.

Claims

1. An automatic control system for washing and separating ternary lithium ion battery precursor, comprising: a washing and separating device, comprising a filter press, wherein a slurry inlet, a conveying inlet, a discharge outlet, a pressing inlet and a back flushing inlet are arranged on the filter press; a valve station device, comprising: a slurry pipeline connected with the slurry inlet and provided with a slurry control valve; a pressing gas pipeline connected with the pressing inlet and provided with a pressing gas control valve and a gas release valve; a dry blowing gas pipeline connected with the conveying inlet and provided with a dry blowing gas control valve; a washing water pipeline connected with the slurry inlet and the conveying inlet and provided with a washing water control valve; a back flushing pipeline connected with the back flushing inlet and provided with a back flushing control valve; a filtrate pipeline connected with the conveying inlet and provided with a filtrate control valve; a conveying device arranged at one end below the discharge outlet; a controller connected with the filter press, the control valves and the conveying device, and configured to control the opening and closing of the filter press, the control valves and the conveying device according to a preset program to realize the processes of liquid feeding, pressing, back flushing, washing, filtrate discharging, dry blowing and product conveying.

2. The automatic control system for washing and separating the ternary lithium-ion battery precursor according to claim 1, wherein Further comprising a back flow pipeline connected with the slurry inlet and provided with a slurry back flow control valve.

3. The automatic control system for washing and separating the ternary lithium-ion battery precursor according to claim 1, wherein, The conveying inlet comprises a left lower discharge outlet, a right lower discharge outlet, a left upper discharge outlet and a right upper discharge outlet, and a control valve is arranged on each discharge outlet.

4. The automatic control system for washing and separating the ternary lithium-ion battery precursor according to claim 1, wherein, Further comprising a pressure control valve connected with the gas release valve arranged on the gas release valve pipeline and a central washing control valve connected with the slurry inlet arranged on the slurry pipeline.

5. The automatic control system for washing and separating the ternary lithium-ion battery precursor according to claim 1, wherein, The filtrate control valve comprises turbid liquid control valve, mother liquor control valve and washing liquid control valve arranged in parallel.

6. A method of using the automatic control system for washing and separating the ternary lithium-ion battery precursor, wherein the automatic control system for washing and separating the ternary lithium-ion battery precursor according to any one of claims 1-5 is operated, characterized in that, comprising: S1, compacting the filter press and opening the slurry control valve to make the slurry enter the filter press of the washing and separating device; S2, opening the pressing gas control valve to make the pressing gas enter the filter press to press the slurry in the filter press; S3, opening the back flushing control valve to clean the residual liquid in the slurry pipeline; S4, opening the washing water control valve to make the washing water enter the washing and separating device to soak and wash the filter cake, and opening the filtrate control valve to discharge the washing water; S5, controlling the filter press to further press the filter cake and discharge the filtrate; S6, opening the back flushing control valve again to clean the residual liquid in the slurry pipeline; S7, opening the dry blowing gas control valve to blow gas into the filter press to reduce the water content of the filter cake; S8, opening the back flushing control valve again to clean the residual liquid in the slurry pipeline; S9, opening the gas release valve to empty the pressing gas, and then opening the filter press to unload the filter cake to the conveying device for conveying.

7. The use method of the automatic control system for washing and separating ternary lithium ion battery precursor according to claim 6, wherein the slurry feeding process in S1 comprises a first slurry feeding stage, a second slurry feeding stage and a third slurry feeding stage, wherein the first slurry feeding stage is a preliminary cake hanging stage, the second slurry feeding stage makes the filter cake arranged uniformly, and the third slurry feeding stage makes the filter chamber full of slurry.

8. The use method of the automatic control system for washing and separating ternary lithium ion battery precursor according to claim 6, wherein the process of the pressing gas entering the filter press in S2 comprises a pre-pressing gas feeding stage, a pre-pressing pressure adjusting stage and a pre-pressing pressure maintaining stage, wherein the pre-pressing gas feeding stage compacts the filter cake, and the pre-pressing pressure adjusting stage and the pre-pressing pressure maintaining stage discharge the liquid in the filter chamber.

9. The method of using the automatic control system for washing and separating the trinary lithium ion battery precursor according to claim 6, wherein, The washing process of the washing water in S4 includes slurry port washing and delivery port washing.

Images