CN212237059U - High-efficient dispersion equipment is mediated in advance to lithium battery thick liquids - Google Patents
High-efficient dispersion equipment is mediated in advance to lithium battery thick liquids Download PDFInfo
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- CN212237059U CN212237059U CN201922358855.2U CN201922358855U CN212237059U CN 212237059 U CN212237059 U CN 212237059U CN 201922358855 U CN201922358855 U CN 201922358855U CN 212237059 U CN212237059 U CN 212237059U
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Abstract
The invention discloses a high-efficiency dispersing device for premixing and kneading lithium battery slurry, which comprises a special high-speed mixing device, a premixing dispersion machine, a circulating tank, a stirring machine, a solvent metering tank and a discharging tank. Premixing and kneading the binder, the solvent and the conductive agent powder in a special high-speed mixing device to obtain first premixed slurry; the conductive base is mixed in a solvent metering tank to obtain a second premixed slurry. And (3) simultaneously conveying the mixed slurry into a premixing dispersion machine through a pipeline, conveying the mixed slurry obtained by dispersion into a circulating tank, returning the mixed slurry into the premixing dispersion machine through the pipeline for continuous dispersion after the circulation is filled, and conveying the mixed slurry into a stirring machine for continuous stirring and discharging after 2 circulations are filled. The invention can solve the problem of wetting powder before dry mixing of lithium battery slurry and improve the stirring production efficiency. The slurry after premixing and kneading has excellent dispersion effect, improves the granularity of the slurry and ensures uniform dispersion. The circulating device can continuously disperse, the production efficiency is improved, and the energy consumption is reduced.
Description
Technical Field
The utility model relates to a high-efficient dispersion equipment is mediated in advance to lithium battery thick liquids belongs to lithium ion battery and makes the field.
Background
In a commercialized rechargeable battery, the specific energy of the lithium ion battery is highest, the rechargeable battery can be thinned, and the rechargeable battery is known as a battery in the 21 st century, so that a new age of storage batteries is developed, and the development prospect is very optimistic. The positive electrode slurry in the electrode manufacturing of the lithium ion battery consists of an adhesive, a conductive agent, a positive electrode material and the like; the negative electrode slurry is composed of a binder, graphite carbon powder and the like. With the continuous progress of lithium ion battery materials, the particle size of raw material particles is smaller and smaller, so that the performance of the lithium ion battery is improved, and secondary aggregates are easy to form, thereby increasing the difficulty of a mixing and dispersing process. The control of the microstructure inside the electrode plate is a key technology in the production process of the lithium ion battery. Therefore, in the process of preparing the electrode plate, the mixing and dispersing quality of the lithium ion battery slurry must be well controlled, and the uniformity and the dispersion stability of the battery slurry are improved. The traditional battery slurry stirring method generally adopts two methods of 'wet mixing stirring' and 'dry mixing stirring', however, in the stirring process of the two methods, the 'wet mixing stirring' is easy to cause the problems of long dispersion time of active substances, conductive agents and other powder materials, low efficiency, unsatisfactory dispersion effect, easy agglomeration of the conductive agents, uneven slurry mixing, accelerated equipment loss and shortened equipment service life.
Chinese patent CN201810978484.5 discloses a battery slurry stirring device, which comprises a first box and a second box, wherein a driving mechanism is arranged in the first box, and the second box is provided with a stirring mechanism and a downward concave bottom. Drive arrangement provides power for rabbling mechanism, and the bottom undercut can make the battery thick liquids pile up automatically, and this utility model can carry out effectual stirring to the battery thick liquids. However, insufficient stirring tends to result in incomplete dispersion of the slurry.
Chinese patent CN201810503287.8 discloses a lithium battery slurry vacuum stirring device and a processing technology, the device comprises a base, a stirring box located above the base and a lifting support. The lifting support is positioned at the tops of the bases on two sides of the stirring box, a cross beam is arranged at the top of the lifting support, a vacuum extractor is arranged at the top of the cross beam, and a powder screening device is arranged on the cross beam; the base top is provided with the slide rail, agitator tank and slide rail sliding fit. The powder material of the synthesized lithium battery slurry is subjected to vibration filtering and screening through the powder material screening device, and is slowly added in the stirring process of the liquid slurry, so that the mixing effect of the liquid slurry and the solid powder material can be improved. But the stirring efficiency is not high due to the limitation of the device.
Chinese patent CN201710163241.1 discloses a novel stirring process for lithium ion battery anode slurry, which comprises the following steps: (1) preparing a conductive adhesive solution, (2) infiltrating active substances, (3) stirring at normal temperature at a low speed in a forward and reverse mode, (4) stirring at a high speed in a vacuum mode, and (5) adjusting the viscosity and solid content of the slurry to discharge to prepare the lithium ion battery anode slurry. The utility model discloses a lithium ion battery positive pole thick liquids dispersion uniformity can be improved to a certain extent, the loss that can reduce agitated vessel simultaneously, the life of extension equipment. But the slurry obtained by the process stirring of the utility model has poor dispersion uniformity and stability.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model aims to provide a high-efficient dispersion equipment is mediated in advance to lithium battery thick liquids. Integrates the advantages of the wet mixing stirring method and the dry mixing stirring method, effectively improves the dispersion uniformity of the slurry, reduces the loss of the equipment and prolongs the service life of the equipment. On this basis, circulating device can improve the efficiency of thick liquids stirring greatly.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a high-efficient dispersion equipment is mediated in premixing of lithium battery thick liquids which characterized in that: comprises special high-speed mixing equipment, a premixing dispersion machine, a first circulating tank, a second circulating tank, a stirrer, a solvent metering tank and a discharge tank; the special high-speed mixing equipment is connected with a second feed inlet of the premixing dispersion machine through a special high-speed mixing equipment discharge port arranged on the special high-speed mixing equipment; the premixing dispersion machine is also provided with a first feeding hole of the premixing dispersion machine and a discharging hole of the premixing dispersion machine, and the discharging hole of the premixing dispersion machine is connected with a feeding hole of a circulation tank arranged on the first circulation tank and a second feeding hole of the circulation tank arranged on the second circulation tank; the first feed inlet of the premixing dispersion machine is respectively connected with a first circulation tank discharge port arranged on the first circulation tank and a second circulation tank discharge port arranged on the second circulation tank; the solvent metering tank is connected with a first feeding hole of the circulating tank arranged in the second circulating tank through a discharging hole of the solvent metering tank arranged on the solvent metering tank; the discharge port of the first circulating tank and the discharge port of the second circulating tank are respectively connected with the feed inlet of a stirrer arranged on the stirrer, and the stirrer is connected with the feed inlet of a discharge tank arranged on the discharge tank through the discharge port of the stirrer.
The premixing dispersion machine is connected with the discharge ports of the first circulation tank and the second circulation tank, and after the first circulation tank and the second circulation tank are filled with slurry, the slurry is respectively conveyed into the premixing dispersion machine through the discharge ports, so that the slurry returns to the premixing dispersion machine, and the slurry can be circularly and repeatedly stirred for many times.
The operation mechanism of the high-efficiency dispersing equipment for premixing and kneading lithium battery slurry comprises the following steps:
a. conveying active substance powder, a conductive agent and a binder to the special high-speed mixing equipment through a central control device according to a certain proportion, premixing and kneading to prepare premixed powder, and conveying the obtained premixed powder to the premixing dispersion machine;
b. premixing the conductive base material in the solvent metering tank to prepare a premixed solvent, storing the prepared premixed solvent in a second circulating tank 4, and conveying the premixed solvent and premixed powder into the premixing dispersion machine together after the production starts;
c. fully premixing and dispersing the premixed powder and the premixed solvent in a premixing dispersion machine to prepare premixed slurry, conveying the premixed slurry into a first circulating tank 3, opening a feed inlet of the premixing dispersion machine at the moment after the first circulating tank 3 is full, returning the slurry into the premixing dispersion machine, and repeatedly and circularly stirring and dispersing;
d. after all the premixed solvent in the second circulation tank 4 enters the premixing dispersion machine, the premixed slurry in the step c starts to enter the second circulation tank 4, and after the second circulation tank 4 is full, the premixed slurry returns to the premixing dispersion machine from the discharge port, and is continuously and repeatedly stirred and dispersed;
f. the premixing disperser, the first circulating tank 3 and the second circulating tank 4 can complete one-time premixing and circulating dispersion within 5-7 minutes, the circulation is carried out for 4-8 times, and the prepared fully-mixed premixed slurry can be conveyed to the stirrer through the discharge port and then is continuously stirred and dispersed;
g. and (5) detecting and recording the pulping time, the viscosity and the solid content of the pulp, and discharging.
The utility model adopts the above structure to gain beneficial effect as follows: the utility model provides a pair of high-efficient dispersion equipment is mediated in advance to lithium battery thick liquids, through mediating in advance, synthesized the advantage of "wet mixing stirring" and "dry mixing stirring" two kinds of methods. Through repeated circulation dispersion, the dispersion uniformity of the slurry is effectively improved, the problems that the slurry is not uniformly mixed and the equipment loss is accelerated due to the fact that the conductive agent is easy to agglomerate are solved, the service life of the equipment is shortened, the loss of the equipment is reduced, and the service life of the equipment is prolonged. Meanwhile, the circulating device ensures that the materials are continuously premixed and stirred, and the stirring efficiency of the slurry is greatly improved.
Drawings
FIG. 1 is an overall structure diagram of a lithium battery slurry premixing and kneading high-efficiency dispersing device according to the present invention;
wherein, 1, special high-speed mixing equipment, 2, the dispersion machine in advance, 3, first circulation tank, 4, the second circulation tank, 5, the mixer, 6, the solvent metering tank, 7, the discharge gate of the dispersion machine in advance, 8, the first feed inlet of the dispersion machine in advance, 9, the first feed inlet of second circulation tank, 10, the second feed inlet of second circulation tank, 11, discharge tank, 12, the discharge gate of special high-speed mixing equipment, 13, the second feed inlet of dispersion machine in advance, 14, circulation tank feed inlet, 15, the discharge gate of second circulation tank, 16, the discharge gate of first circulation tank, 17, mixer feed inlet, 18, mixer discharge gate, 19, discharge tank feed inlet, 20, the discharge gate of solvent metering tank.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following embodiments, and the technical features or the connection relations of the present invention, which are not described in detail, are the prior art adopted.
The present invention will be described in further detail with reference to fig. 1.
The utility model provides a high-efficiency dispersing device for premixing and kneading lithium battery slurry, which comprises a special high-speed mixing device 1, a premixing dispersion machine 2, a first circulating tank 3, a second circulating tank 4, a stirrer 5, a solvent metering tank 6 and a discharge tank 11;
the special high-speed mixing equipment 1 is connected with a second feed inlet 13 of the premixing dispersion machine, which is arranged on the premixing dispersion machine 2, through a special high-speed mixing equipment discharge port 12 arranged on the special high-speed mixing equipment; the premixing dispersion machine 2 is also provided with a first feed inlet 8 of the premixing dispersion machine and a discharge outlet 7 of the premixing dispersion machine, and the discharge outlet 7 of the premixing dispersion machine is connected with a feed inlet 14 of a circulation tank arranged on the first circulation tank 3 and a second feed inlet 10 of the circulation tank arranged on the second circulation tank 4; the first feed port 8 of the premixing dispersion machine is respectively connected with a first circulation tank discharge port 16 arranged on the first circulation tank 3 and a second circulation tank discharge port 15 arranged on the second circulation tank 4;
the solvent metering tank 6 is connected with a first feeding hole 9 of the circulating tank arranged on the second circulating tank 4 through a solvent metering tank discharging hole 20 arranged on the solvent metering tank;
the first circulation tank discharge port 16 and the second circulation tank discharge port 15 are respectively connected with a stirrer feed port 17 arranged on the stirrer 5, and the stirrer 5 is connected with a discharge tank feed port 19 arranged on the discharge tank 11 through a stirrer discharge port 18 arranged on the stirrer 5.
It is right below through a plurality of embodiments the utility model discloses the operation mechanism and the effect of device are elucidated:
the operation mechanism of the high-efficiency dispersing equipment for premixing and kneading lithium battery slurry comprises the following steps:
a. conveying active substance powder, a conductive agent and a binder to a special high-speed mixing device through a central control device according to a certain proportion for premixing and kneading to prepare premixed powder, and conveying the obtained premixed powder to a premixing dispersion machine;
b. premixing the conductive base material in a solvent metering tank to prepare a premixed solvent, storing the prepared premixed solvent in a second circulating tank 4, and conveying the premixed solvent and premixed powder together into a premixing dispersion machine after production starts;
c. fully premixing and dispersing the premixed powder and the premixed solvent in a premixing dispersion machine to prepare premixed slurry, conveying the premixed slurry into a first circulating tank 3, enabling the premixed slurry to flow out of a discharge hole after the first circulating tank 3 is full, opening a feed hole of the premixing dispersion machine at the moment, enabling the slurry to return to the premixing dispersion machine, and repeatedly and circularly stirring and dispersing;
d. c, after all the premixed solvent in the circulating tank enters the premixing dispersion machine, the premixed slurry in the step c starts to enter a second circulating tank 4, and after the second circulating tank 4 is full, the premixed slurry returns to the premixing dispersion machine from a discharge port, and is continuously and repeatedly stirred and dispersed;
f. the premixing disperser, the first circulating tank 3 and the second circulating tank 4 can complete one-time premixing circulating dispersion within 5 minutes, and the fully mixed premixed slurry prepared by circulating for many times can be conveyed to the stirrer through the discharge port and then continuously stirred and dispersed;
g. and (5) detecting and recording the pulping time, the viscosity and the solid content of the pulp, and discharging.
The first embodiment is as follows:
a. conveying an active substance LFP powder (lithium iron phosphate), a conductive agent SP (carbon black) and a binder PVDF to a special high-speed mixing device 1 through a central control device according to a ratio of 90:1:2, and premixing and kneading for 10min at a rotating speed of 1090rpm to prepare premixed powder;
b. conductive binder 5% CNT paste and NMP were mixed at a ratio of 1: 80 in the solvent metering tank 2, the rotating speed is 2500rpm, the pump speed is 50L/min, the prepared premixed solvent is prepared, the prepared premixed solvent is stored in the second circulating tank 4, and after the production is started, the premixed solvent and the premixed powder are conveyed into a premixing dispersion machine;
c. fully premixing and dispersing the premixed powder and the premixed solvent in a premixing dispersion machine at the rotating speed of 2000rpm and the pump speed of 50L/min to prepare premixed slurry, conveying the premixed slurry into a first circulating tank 3, enabling the premixed slurry to flow out of a discharge hole after the first circulating tank 3 is full, opening a feed hole of the premixing dispersion machine at the moment, enabling the slurry to return to the premixing dispersion machine, and repeatedly stirring and dispersing for 40 times;
d. after all the premixed solvent in the second circulation tank 4 enters the premixing dispersion machine, the premixed slurry in the step c starts to enter the second circulation tank 4, after the second circulation tank 4 is full, the premixed slurry returns to the premixing dispersion machine from the discharge port, the premixing dispersion machine is continuously and repeatedly stirred and dispersed for 12 times, the prepared fully mixed premixed slurry can be conveyed to the stirring machine through the discharge port, and then the stirring dispersion is continuously carried out, so that the first slurry is obtained;
f. and (5) detecting and recording the pulping time, the viscosity and the solid content of the pulp, and discharging.
Example two:
a. mixing graphite serving as an active material, a conductive agent SP and a binder CMC in a ratio of 96: 2: 0.6 proportion is conveyed to a special high-speed mixing device 1 through a central control device for premixing and kneading for 10min at the rotating speed of 1090rpm to prepare premixed powder;
b. premixing a binding agent SBR (styrene butadiene latex with the solid content of 50%) in a solvent metering tank 6 at the rotating speed of 3000rpm and the pump speed of 50L/min to prepare a premixed solvent, storing the prepared premixed solvent in a second circulating tank 4, and conveying the premixed solvent and premixed powder into a premixing dispersion machine after the production starts;
c. fully premixing and dispersing the premixed powder and the premixed solvent in a premixing dispersion machine at the rotating speed of 3000rpm and the pump speed of 50L/min to prepare premixed slurry, conveying the premixed slurry into a first circulating tank 3, enabling the premixed slurry to flow out of a discharge hole after the first circulating tank 3 is full, opening a feed hole of the premixing dispersion machine at the moment, enabling the slurry to return to the premixing dispersion machine, and repeatedly and circularly stirring and dispersing for 16 times;
d. after all the premixed solvent in the second circulation tank 4 enters the premixing dispersion machine, the premixed slurry in the step c starts to enter the second circulation tank 4, after the second circulation tank 4 is full, the premixed slurry returns to the premixing dispersion machine from the discharge port, the premixing dispersion machine is continuously and repeatedly stirred and dispersed for 16 times, the prepared fully mixed premixed slurry can be conveyed to the stirrer through the discharge port, and then the premixed slurry is continuously stirred and dispersed to obtain second slurry;
f. and testing the pulping time, the viscosity and the solid content of the pulp, and discharging.
Comparative example one:
a. the second circulation tank 4 was closed, and the active material LFP powder (lithium iron phosphate), the conductive agent SP (carbon black), and the binder PVDF at a ratio of 90:1:2 were mixed with the conductive base 5% CNT paste and NMP at a ratio of 1: 80 are added into the premixing disperser at the same time;
b. adjusting the premixing dispersion machine, wherein the rotating speed is 2000rpm, the pump speed is 50L/min, preparing premixed slurry, conveying the premixed slurry into the first circulating tank 3, enabling the premixed slurry to flow out of the discharge hole after the first circulating tank 3 is full, opening the feed hole of the premixing dispersion machine at the moment, enabling the slurry to return to the premixing dispersion machine, and repeatedly and circularly stirring and dispersing for 40 times;
c. the prepared fully mixed premixed slurry can be conveyed to a stirrer through a discharge port, and then is continuously stirred and dispersed to obtain a third slurry;
d. and (5) detecting and recording the pulping time, the viscosity and the solid content of the pulp, and discharging.
Comparative example two:
a. the second circulation tank 4 was closed, and the active material graphite, the conductive agent SP, and the binder CMC were mixed at a ratio of 96: 2: 0.6 proportion and a binding agent SBR (styrene butadiene rubber latex with solid content of 50 percent) are added into a premixing dispersion machine at the same time;
b. fully premixing and dispersing in a premixing dispersion machine at the rotating speed of 3000rpm and the pump speed of 50L/min to prepare premixed slurry, conveying the premixed slurry into a first circulating tank 3, enabling the premixed slurry to flow out of a discharge hole after the first circulating tank 3 is full, opening a feed hole of the premixing dispersion machine at the moment, enabling the slurry to return to the premixing dispersion machine, and repeatedly and circularly stirring and dispersing for 16 times;
c. the prepared fully mixed premixed slurry can be conveyed to a stirrer through a discharge port, and then is continuously stirred and dispersed to obtain a fourth slurry;
d. and (5) detecting and recording the pulping time, the viscosity and the solid content of the pulp, and discharging.
The first, second, third and fourth slurries were tested for pulping time, viscosity and solids content in three experiments per case following the procedure described in example one, example two, comparative example one and comparative example two. The results are shown in Table 1.
Table 1 slurry viscosity/solids data table
| Pulping time/min | viscosity/mPas | Solids content/% | |
| First paste (1 st time) | 150 | 6000 | 58.5 |
| First paste (2 nd time) | 149 | 7500 | 59 |
| First paste (3 rd time) | 147 | 8000 | 60 |
| Second paste (1 st time) | 67 | 3000 | 50 |
| Second paste (2 nd time) | 70 | 5500 | 51 |
| Second paste (3 rd time) | 68 | 6000 | 51.5 |
| Third paste (1 st time) | 170 | 5400 | 51 |
| Third paste (2 nd time) | 173 | 5500 | 52.5 |
| Third paste (3 rd time) | 175 | 6000 | 53 |
| Fourth paste (1 st time) | 193 | 3000 | 43 |
| Fourth paste (2 nd time) | 188 | 4000 | 43.5 |
| Fourth paste (3 rd time) | 189 | 5100 | 44 |
As can be seen from the data in table 1, the time required for the positive electrode slurry obtained by pre-mixing the first slurry and the third slurry by using a special high-speed dispersing device and then mixing and stirring the first slurry and the third slurry with a premixed solvent is shorter than that of the positive electrode slurry obtained by directly preparing the positive electrode slurry by using a premixed dispersing machine, and the solid content of the first slurry is higher than that of the third slurry when the viscosity is within a reasonable range of the process requirement. Compared with the fourth slurry, the second slurry and the fourth slurry are pre-mixed by special high-speed dispersing equipment and then mixed and stirred with the premixed solvent to obtain the cathode slurry, the time required by the cathode slurry is shorter than that of the cathode slurry directly prepared by a premixed disperser, and the solid content of the second slurry is higher than that of the third slurry under the condition that the viscosity is within a reasonable range of the process requirement. It is shown that the slurry kneaded by premixing is dispersed more efficiently and the solid content is also increased.
The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (1)
1. The utility model provides a high-efficient dispersion equipment is mediated in premixing of lithium battery thick liquids which characterized in that: comprises a special high-speed mixing device (1), a premixing dispersion machine (2), a first circulating tank (3), a second circulating tank (4), a stirrer (5), a solvent metering tank (6) and a discharge tank (11);
the special high-speed mixing equipment (1) is connected with a second feeding hole (13) of the premixing dispersion machine, which is arranged on the premixing dispersion machine (2), through a special high-speed mixing equipment discharging hole (12) arranged on the special high-speed mixing equipment;
the premixing dispersion machine (2) is also provided with a first feed inlet (8) of the premixing dispersion machine and a discharge outlet (7) of the premixing dispersion machine, and the discharge outlet (7) of the premixing dispersion machine is connected with a feed inlet (14) of a circulation tank arranged on the first circulation tank (3) and a second feed inlet (10) of the circulation tank arranged on the second circulation tank (4); a first feed port (8) of the premixing dispersion machine is respectively connected with a first circulation tank discharge port (16) arranged on the first circulation tank (3) and a second circulation tank discharge port (15) arranged on the second circulation tank (4);
the solvent metering tank (6) is connected with a first feeding hole (9) of the circulating tank, which is arranged on the second circulating tank (4), through a solvent metering tank discharging hole (20) arranged on the solvent metering tank;
the first circulation tank discharge port (16) and the second circulation tank discharge port (15) are respectively connected with a stirrer feed port (17) arranged on the stirrer (5), and the stirrer (5) is connected with a discharge tank feed port (19) arranged on the discharge tank (11) through a stirrer discharge port (18) arranged on the stirrer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113101855A (en) * | 2021-05-12 | 2021-07-13 | 无锡理奇智能装备有限公司 | Preparation system and preparation method of continuous lithium battery slurry |
| CN114307800A (en) * | 2022-01-25 | 2022-04-12 | 广东佳成新能源有限公司 | Lithium battery material preparation system and preparation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113101855A (en) * | 2021-05-12 | 2021-07-13 | 无锡理奇智能装备有限公司 | Preparation system and preparation method of continuous lithium battery slurry |
| CN114307800A (en) * | 2022-01-25 | 2022-04-12 | 广东佳成新能源有限公司 | Lithium battery material preparation system and preparation method |
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