CN115888593A - Control system for eliminating lithium battery precursor ternary material coprecipitation product difference - Google Patents
Control system for eliminating lithium battery precursor ternary material coprecipitation product difference Download PDFInfo
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- CN115888593A CN115888593A CN202211622954.7A CN202211622954A CN115888593A CN 115888593 A CN115888593 A CN 115888593A CN 202211622954 A CN202211622954 A CN 202211622954A CN 115888593 A CN115888593 A CN 115888593A
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Abstract
The invention discloses a control system for eliminating the difference of ternary material coprecipitation products of lithium battery precursors, which comprises a reaction container, a feeding system and a temperature control system, wherein the reaction container is used for accommodating lithium batteries; the feeding system comprises a mixed material liquid tank, and the mixed material liquid tank is connected with a raw material inlet of the reaction container through a feeding pipeline; an inorganic variable-frequency feed liquid delivery pump is arranged on the feeding main pipe; the large-flow branch pipe is provided with a large-flow switch valve and a large-flow detection flowmeter; the small flow branch pipe is provided with a small flow switch valve and a small flow detection flowmeter; the temperature control system comprises a water inlet main pipe connected with a water inlet of the jacket and a water return pipe connected with a water outlet of the jacket; the cold water tank and the hot water tank are respectively connected with the water inlet main pipe through a cold water conveying pipe and a hot water conveying pipe. The advantages are that: the feeding precision is ensured, and the labor intensity of field patrol operators and the misoperation of DCS master control are reduced; meanwhile, the control precision of the temperature of the reaction container is improved, and the fluctuation range is reduced, so that the crystal quality of the triple coprecipitate is improved.
Description
Technical Field
The invention relates to a lithium battery production technology, in particular to a ternary material coprecipitation production device.
Background
The chemical coprecipitation of the ternary positive electrode material of the lithium ion battery precursor in a liquid phase is widely used for synthesizing and reacting to produce powder materials, and a precipitator is added into a mixed solution of salt solutions according to a proportion to perform a synthetic precipitation reaction or the synthetic precipitation reaction is performed by the lithium ion battery precursor after different salt solutions are mixed. However, when the ternary cathode material is prepared, because the solubility product constants of the three salts are different, the preparation of uniform ternary coprecipitate is relatively difficult, and the coprecipitation reaction can be uniformly carried out only by strictly controlling the conditions of the synthesis reaction. And the nucleation rate, the supersaturation degree of the solution and the reaction temperature influence the reaction nucleation rate in the precipitation reaction process and influence the crystal quality of the final product.
The supersaturation degree of the solution has a certain relation with the adding amount of the added raw materials and the temperature of a reaction tank (or a kettle), and because the adding amount of the sulfate which is prepared in proportion at different stages of the flow rate is changed, the maximum adding amount is 5-10 times of the minimum adding amount, and the flow rate of the added sulfate is controlled in two ways at present: the flow regulation control adopts a flow meter and a regulating valve mode, but because the flow difference between large flow and small flow is large, the minimum flow is small, the PID parameters of the regulating valve are different under the condition of different flow, the material flow can be regulated timely, stably and accurately, DCS operators frequently regulate the PID parameters, misoperation is easy to cause the quality problem of products, and meanwhile, proper regulating valves cannot be selected for regulating the small flow added in the reaction process;
the mode two flow regulation adopts measuring pump + flowmeter control, because the flow that adds in different stages is different and needs the field control measuring pump stroke just can adjust the flow, if the operating strength of field operation personnel is big under the condition that retort (cauldron) are more in quantity, the flowmeter need monitor the low discharge simultaneously promptly for large-traffic, the precision of flowmeter is relative low.
At present, the temperature control of a sulfate coprecipitation reaction tank (or kettle) is generally carried out by adopting the temperature of the reaction tank (or kettle) and a jacket cold and hot (or steam) regulation method to carry out single-loop interlocking control: the temperature of the tank (or kettle) in the reaction stage is low, the opening of the hot water (or steam) regulating valve is increased, the hot water (or steam) flux of the reaction tank (or kettle) is increased, and the internal temperature is increased; if the temperature of the tank (or kettle) in the reaction stage is high, the opening of the cold water regulating valve is increased, the cooling water flux of the reaction tank (or kettle) is increased, and the internal temperature is reduced. The control method is characterized in that the cold water valve and the hot water valve are not disconnected and closed alternately all the time, the temperature of a reaction tank (or a kettle) is always in a fluctuation state, the nucleation rate in the material is also always in fluctuation, and the crystal quality of a formed product is influenced finally.
Disclosure of Invention
In order to ensure the feeding precision and reduce the labor intensity of field patrol operators and the operation error of DCS general control; meanwhile, the control precision of the temperature of the reaction tank (or kettle) is improved, and the fluctuation range is reduced, so that the crystal quality of the ternary coprecipitation product is improved.
The technical scheme adopted by the invention is as follows: the control system for eliminating the difference of the ternary material coprecipitation product of the lithium battery precursor comprises a reaction container, a feeding system and a temperature control system; the reaction vessel comprises a jacket and a reaction vessel temperature detector for detecting the internal temperature of the vessel; the feeding system comprises a mixed material liquid tank, and the mixed material liquid tank is connected with a raw material inlet of the reaction container through a feeding pipeline; the feeding pipeline comprises a feeding main pipe, a large-flow branch pipe and a small-flow branch pipe which are connected with the feeding main pipe and are mutually connected in parallel; an inorganic variable-frequency feed liquid delivery pump is arranged on the feeding main pipe; the high-flow branch pipe is provided with a high-flow switch valve and a high-flow detection flowmeter; the small flow branch pipe is provided with a small flow switch valve and a small flow detection flowmeter; the temperature control system comprises a water inlet main pipe connected with a water inlet of the jacket and a water return pipe connected with a water outlet of the jacket; the cold water tank and the hot water tank are respectively connected with a water inlet main pipe through a cold water conveying pipe and a hot water conveying pipe, and a cold water feeding adjusting valve and a hot water feeding adjusting valve are respectively arranged on the cold water conveying pipe and the hot water conveying pipe; a water supply temperature detector is arranged on the water inlet main pipe; and a return water temperature detector is arranged on the return water pipe.
As a further improvement of the invention, the water feeding temperature detector, the return water temperature detector, the reaction container temperature detector, the cold water feeding regulating valve and the hot water feeding regulating valve carry out reaction temperature interlocking control through a DCS program.
The specific control method can be set as follows: and the DCS program compares the temperature measured by the reaction container temperature detector and the temperature measured by the return water temperature detector by taking the reaction control temperature set in the DCS as an operation value: if the calculated value is higher than the temperature measured by the backwater temperature detector, the hot water feeding regulating valve is opened to heat the materials in the reaction container; otherwise, if the calculated value is lower than the temperature measured by the backwater temperature detector, the cold water feeding regulating valve is opened to regulate the temperature of the materials in the reaction container.
As a further improvement of the invention, the inorganic variable-frequency feed liquid delivery pump, the large-flow switch valve, the large-flow detection flowmeter, the small-flow switch valve and the small-flow detection flowmeter adopt a DCS program to carry out feeding flow interlocking control.
The specific control method can be set as follows: the mixed raw material in the mixed material liquid tank is automatically adjusted by an inorganic variable-frequency material liquid delivery pump according to the adding stage set by a DCS program and the adding flow rate, and the flow rate for monitoring the delivery flow rate is selected according to the flow rate and is a large-flow detection flowmeter or a small-flow detection flowmeter; the DCS program automatically opens a large-flow switch valve or a small-flow switch valve in front of the corresponding flowmeter to add reaction liquid into the reaction container; and automatically reselecting the adding stage and the adding amount by the DCS program after the adding amount at the stage is added, then correspondingly adjusting according to the logic until the amount of the material liquid added into the reaction container reaches the required total amount, and ending the adding program.
As a further improvement of the invention, the water inlet main pipe is also provided with a cold and hot water mixer.
The invention also discloses a lithium ion battery precursor ternary material production device which is characterized by comprising the control system for eliminating the difference of the lithium ion battery precursor ternary material coprecipitation product as claimed in any one of claims 1 to 6.
The invention has the beneficial effects that: the invention provides a method for automatically, stably, continuously and accurately adding a sulfate reaction raw material into a reaction tank (or kettle), which can ensure the adding precision, reduce the labor intensity of field patrol operators and the operation error of DCS master control, improve the control precision of the temperature of the reaction tank (or kettle), reduce the fluctuation range and finally improve the quality of triple coprecipitation crystal.
Drawings
FIG. 1 is a schematic structural diagram of a control system for eliminating the difference of ternary material coprecipitation products of lithium battery precursors.
FIG. 2 is a logic diagram of the temperature interlock control of the reaction by the DCS program.
FIG. 3 is a logic diagram of the interlocking control of feed flow by the DCS program.
Labeled as: 1-reaction vessel, 101-jacket, 102-reaction vessel temperature detector, 201-mixed material liquid tank, 202-inorganic variable frequency material liquid delivery pump, 203-large flow switch valve, 204-large flow detection flowmeter, 205-small flow switch valve, 206-small flow detection flowmeter, 301-cold water tank, 302-hot water tank, 303-cold water feeding regulating valve, 304-hot water feeding regulating valve, 305-feeding water temperature detector, 306-return water temperature detector, 307-cold water and hot water temperature mixer.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in figure 1, the control system for eliminating the difference of the ternary material coprecipitation product of the lithium battery precursor comprises a reaction container 1, a feeding system and a temperature control system; the reaction vessel 1 comprises a jacket 101 and a reaction vessel temperature detector 102 for detecting the temperature inside the vessel; the method is characterized in that: the feeding system comprises a mixture liquid tank 201, and the mixture liquid tank 201 is connected with a raw material inlet of the reaction container 1 through a feeding pipeline; the feeding pipeline comprises a feeding main pipe, a large-flow branch pipe and a small-flow branch pipe which are connected with the feeding main pipe and are mutually connected in parallel; an inorganic variable-frequency feed liquid delivery pump 202 is arranged on the feeding main pipe; a large-flow switch valve 203 and a large-flow detection flowmeter 204 are arranged on the large-flow branch pipe; the small flow branch pipe is provided with a small flow switch valve 205 and a small flow detection flowmeter 206; the temperature control system comprises a water inlet main pipe connected with a water inlet of the jacket 101 and a water return pipe connected with a water outlet of the jacket; the cold water tank 301 and the hot water tank 302 are respectively connected with a water inlet main pipe through a cold water conveying pipe and a hot water conveying pipe, and the cold water conveying pipe and the hot water conveying pipe are respectively provided with a cold water feeding regulating valve 303 and a hot water feeding regulating valve 304; the water inlet main pipe is provided with a water feeding temperature detector 305 and a cold and hot water temperature mixer 307; a return water temperature detector 306 is arranged on the return water pipe. The water supply temperature detector 305, the return water temperature detector 306, the reaction vessel temperature detector 102, the cold water supply regulating valve 303 and the hot water supply regulating valve 304 perform reaction temperature interlocking control through a DCS program. The inorganic variable-frequency feed liquid delivery pump 202, the large-flow switch valve 203, the large-flow detection flowmeter 204, the small-flow switch valve 205 and the small-flow detection flowmeter 206 adopt DCS programs to carry out feeding flow interlocking control.
As shown in fig. 3, the logic of the feed flow interlock control is as follows: the inorganic variable frequency feed liquid delivery pump 202 automatically adjusts the rotating speed of the motor of the inorganic variable frequency feed liquid delivery pump 202 according to the adding stage set by a DCS program and the adding flow rate of the mixed raw materials in the mixed material liquid tank 201, and simultaneously, the flow rate for monitoring the delivery flow rate is selected according to the flow rate, namely a large-flow detection flow meter 204 or a small-flow detection flow meter 206; the DCS program automatically opens a large-flow switch valve 203 or a small-flow switch valve 205 in front of the corresponding flowmeter to add reaction liquid into the reaction container 1; and after the addition of the addition amount in the stage is finished, automatically reselecting the addition stage and the addition amount by the DCS program, then correspondingly adjusting according to the logic until the amount of the feed liquid added into the reaction container 1 reaches the required total amount, and finishing the feeding program.
As shown in fig. 2, the reaction temperature linkage control method comprises: the DCS program compares the temperature measured by the return water temperature detector 306 with the temperature measured by the reaction vessel temperature detector 102 and the reaction control temperature set in the DCS as calculated values: if the calculated value is higher than the temperature measured by the backwater temperature detector 306, the hot water feeding regulating valve 304 is opened to heat the materials in the reaction container; otherwise, if the calculated value is lower than the temperature detected by the return water temperature detector 306, the cold water feeding regulating valve 303 is opened to regulate the temperature of the materials in the reaction container. Meanwhile, the phenomenon that the adjusting valve of the jacket cooling water or hot water starts to cause the sudden temperature rise or temperature drop of the jacket is avoided, and the transient local rapid nucleation or sudden transient local slow-down occurs in the reaction tank (or the kettle).
Claims (7)
1. The control system for eliminating the difference of the ternary material coprecipitation product of the lithium battery precursor comprises a reaction container (1), a feeding system and a temperature control system; the reaction vessel (1) comprises a jacket (101) and a reaction vessel temperature detector (102) for detecting the temperature inside the vessel; the method is characterized in that: the feeding system comprises a mixed material liquid tank (201), and the mixed material liquid tank (201) is connected with a raw material inlet of the reaction container (1) through a feeding pipeline; the feeding pipeline comprises a feeding main pipe, a large-flow branch pipe and a small-flow branch pipe which are connected with the feeding main pipe and are mutually connected in parallel; an inorganic variable-frequency feed liquid delivery pump (202) is arranged on the feeding main pipe; the large-flow branch pipe is provided with a large-flow switch valve (203) and a large-flow detection flowmeter (204); the small flow branch pipe is provided with a small flow switch valve (205) and a small flow detection flowmeter (206); the temperature control system comprises a water inlet main pipe connected with a water inlet of the jacket (101) and a water return pipe connected with a water outlet of the jacket; the cold water tank (301) and the hot water tank (302) are respectively connected with a water inlet main pipe through a cold water conveying pipe and a hot water conveying pipe, and the cold water conveying pipe and the hot water conveying pipe are respectively provided with a cold water feeding regulating valve (303) and a hot water feeding regulating valve (304); a water supply temperature detector (305) is arranged on the water inlet main pipe; a return water temperature detector (306) is arranged on the return water pipe.
2. The control system for eliminating the difference of the lithium battery precursor ternary material coprecipitation product according to claim 1, wherein the control system comprises: the reaction temperature interlocking control is carried out on the upper water temperature detector (305), the return water temperature detector (306), the reaction container temperature detector (102), the cold water upper water regulating valve (303) and the hot water upper water regulating valve (304) through a DCS program.
3. The control system for eliminating the difference of the lithium battery precursor ternary material coprecipitation product as claimed in claim 2, wherein the reaction temperature linkage control method comprises: the DCS program compares the temperature measured by the reaction container temperature detector (102) and the reaction control temperature set in the DCS as a calculation value with the temperature measured by the return water temperature detector (306): if the calculated value is higher than the temperature measured by the backwater temperature detector (306), the hot water feeding adjusting valve (304) is opened to heat the materials in the reaction container; otherwise, if the calculated value is lower than the temperature measured by the backwater temperature detector (306), the cold water feeding adjusting valve (303) is opened to adjust the temperature of the materials in the reaction container.
4. The control system for eliminating the difference of the lithium battery precursor ternary material coprecipitation product as claimed in claim 1, wherein: the inorganic variable-frequency feed liquid delivery pump (202), the large-flow switch valve (203), the large-flow detection flowmeter (204), the small-flow switch valve (205) and the small-flow detection flowmeter (206) adopt DCS programs to carry out feeding flow interlocking control.
5. The control system for eliminating the difference of the lithium battery precursor ternary material coprecipitation product according to claim 4, wherein the feed flow linkage control method comprises the following steps: the mixed raw materials in the mixed material liquid tank (201) are added by an inorganic variable-frequency feed liquid conveying pump (202) according to the adding stage set by a DCS program and the adding flow rate to automatically adjust the rotating speed of a motor of the inorganic variable-frequency feed liquid conveying pump (202), and meanwhile, the flow rate for monitoring the conveying flow rate is selected according to the flow rate to be a large-flow detection flow meter (204) or a small-flow detection flow meter (206); the DCS program automatically opens a large-flow switch valve (203) or a small-flow switch valve (205) in front of the corresponding flowmeter to add reaction liquid into the reaction container (1); and automatically reselecting the adding stage and the adding amount by the DCS program after the adding amount at the stage is added, then correspondingly adjusting according to the logic until the amount of the material liquid added into the reaction container (1) reaches the required total amount, and ending the adding program.
6. The control system for eliminating the difference of the ternary material coprecipitation product of the lithium battery precursor as claimed in any one of claims 1 to 5, wherein: the water inlet main pipe is also provided with a cold and hot water temperature mixer (307).
7. Lithium ion battery precursor ternary material apparatus for producing which characterized in that: the control system for eliminating the difference of the lithium battery precursor ternary material coprecipitation product is disclosed in any one of claims 1-6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211622954.7A CN115888593A (en) | 2022-12-16 | 2022-12-16 | Control system for eliminating lithium battery precursor ternary material coprecipitation product difference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211622954.7A CN115888593A (en) | 2022-12-16 | 2022-12-16 | Control system for eliminating lithium battery precursor ternary material coprecipitation product difference |
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| CN115888593A true CN115888593A (en) | 2023-04-04 |
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| CN202211622954.7A Pending CN115888593A (en) | 2022-12-16 | 2022-12-16 | Control system for eliminating lithium battery precursor ternary material coprecipitation product difference |
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- 2022-12-16 CN CN202211622954.7A patent/CN115888593A/en active Pending
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