CN117181084A - Battery paste processing method and processing system - Google Patents
Battery paste processing method and processing system Download PDFInfo
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- CN117181084A CN117181084A CN202311277469.5A CN202311277469A CN117181084A CN 117181084 A CN117181084 A CN 117181084A CN 202311277469 A CN202311277469 A CN 202311277469A CN 117181084 A CN117181084 A CN 117181084A
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- 238000012545 processing Methods 0.000 title claims abstract description 24
- 238000003672 processing method Methods 0.000 title claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 156
- 239000000463 material Substances 0.000 claims abstract description 86
- 239000002904 solvent Substances 0.000 claims abstract description 55
- 239000006185 dispersion Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 14
- 239000006258 conductive agent Substances 0.000 claims description 13
- 239000011149 active material Substances 0.000 claims description 12
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 239000011343 solid material Substances 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 238000003860 storage Methods 0.000 description 13
- 238000000265 homogenisation Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 238000012546 transfer Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 239000011267 electrode slurry Substances 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- 239000006257 cathode slurry Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007919 dispersible tablet Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000003826 tablet Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a battery paste processing method and a processing system, wherein the battery paste processing method comprises the following steps: continuously adding main materials and auxiliary materials into the solvent circularly flowing on the first path, mixing and dispersing the solvent, the main materials and the auxiliary materials to obtain a dispersion solution, flowing the dispersion solution into the first path, and mixing and dispersing the dispersion solution with the main materials and the auxiliary materials in the process of each circular flow to obtain a prefabricated slurry; the prefabricated slurry flows circularly between the first path and the second path for multiple times, the prefabricated slurry in the first path flows into the second path after being mixed and dispersed, the prefabricated slurry in the second path flows into the first path after being mixed and dispersed, and the prefabricated slurry after multiple times of circulation is converted into slurry. The battery slurry processing method is beneficial to improving the uniformity of the prefabricated slurry, and is beneficial to further improving the uniformity of the slurry by carrying out mixing and dispersing treatment on the prefabricated slurry in the process of circulating flow for many times between the first path and the second path.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a preparation method of battery slurry. The invention also relates to a battery paste processing system.
Background
With the increasing importance of new energy, lithium ion batteries are becoming more and more popular in various aspects of society as a storage and energy conversion device with high specific energy and long cycle life. Especially, with the development of new energy electric vehicles and energy storage devices, the demand of lithium ion batteries is increasing.
A good lithium ion battery is characterized in that the preparation process of the slurry is called as homogenization, and the homogenization process is a serious problem in the battery manufacturing process. And uniformly mixing and dispersing active substances, a conductive agent, a binder, an additive, a solvent and the like, and obtaining a product which is lithium ion battery slurry. The quality of the battery slurry has decisive effect on the final performance of a battery, such as circulation, multiplying power, safety performance and the like.
The most widely used lithium ion battery homogenizing process in the lithium battery industry is a double-planetary high-speed dispersing process, and mainly comprises the steps of macroscopic mixing and mesoscopic uniform dispersing of slurry by means of a twist-type stirring paddle and a high-speed dispersing disc of a double-planetary stirrer. The process route is mature; but its drawbacks are also particularly evident:
first point problem: when homogenization is performed, the homogenization efficiency is relatively low, and the time taken from the start of homogenization to the discharge of the slurry is too long.
Second point problem: when homogenizing, stirring is continuously carried out, the long homogenizing time means long-time stirring, the machine runs for a long time, the requirement on energy consumption is high, and the energy consumption is high; and the damage to a machine dispersion plate and a stirring paddle caused by long-term operation is high.
Third point problem: the operation process is complex, the material is fed step by step during the homogenization, the homogenization steps are also more and complicated, errors are easy to occur in the production process, and the requirement on production personnel is higher.
Fourth problem: the process route seriously depends on a double planetary mixer, and the single batch homogenization quantity of the mixer is small, and the productivity is low.
Disclosure of Invention
In view of the foregoing, the present invention is directed to a method for processing battery paste, so as to effectively improve the production efficiency of the battery paste, thereby improving the productivity.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a battery paste processing method, comprising the steps of:
continuously adding main materials and auxiliary materials into a solvent which circularly flows on a first path, mixing and dispersing the solvent, the main materials and the auxiliary materials to obtain a dispersion solution, and enabling the dispersion solution to flow into the first path and be mixed and dispersed with the main materials and the auxiliary materials in each circulating flow process to obtain a prefabricated slurry;
the prefabricated slurry flows circularly between the first path and the second path for multiple times, the prefabricated slurry in the first path flows into the second path after being mixed and dispersed, the prefabricated slurry in the second path flows into the first path after being mixed and dispersed, and the prefabricated slurry after multiple times of circulation is converted into slurry.
Further, the method also comprises the steps of detecting the performance parameters of the slurry, and outputting the slurry and performing defoaming treatment when the performance parameters are qualified.
Further, the performance parameters of the slurry include the viscosity of the slurry and the content of solid materials; and/or the number of the groups of groups,
the slurry is output to a slurry tank, and defoaming is performed by vacuumizing the slurry tank.
Further, the number of times N of circulating the pre-slurry between the first path and the second path satisfies: n is more than or equal to 5 and less than or equal to 8; and/or the number of the groups of groups,
the circulation flow time of the pre-slurry is 50-60 minutes.
Further, the first path is subjected to wetting treatment by the solvent before use.
Further, the main material comprises an active material, and the auxiliary material comprises a conductive agent and an adhesive.
Compared with the prior art, the invention has the following advantages:
according to the battery slurry processing method, the main material and the auxiliary material are added into the solvent which circularly flows on the first path and are mixed and dispersed to obtain the dispersion solution, the dispersion solution flows into the first path and is mixed and dispersed with the main material and the auxiliary material for multiple times in the process of circularly flowing, so that the uniformity of the prefabricated slurry is improved, and the mixing and dispersing treatment is performed in the process of circularly flowing between the first path and the second path for multiple times of the prefabricated slurry, so that the uniformity of the slurry and the slurry homogenizing efficiency are improved, and the productivity of the slurry is improved.
In addition, by detecting the performance parameters of the slurry as the basis of whether the slurry is qualified or not, the quality of the slurry is guaranteed, and by defoaming the slurry, the performance and the use effect of the slurry are improved. The viscosity of the slurry and the content of the solid materials are used as performance parameters, and the method has the advantages of easy acquisition and high reference value; the slurry is defoamed in a vacuumizing mode, so that the defoaming device has the advantages of easiness in implementation and good defoaming effect. The number of cycles and the time of the pre-slurry are both favorable for ensuring the homogenization effect. The first path is subjected to wetting treatment by the solvent, so that the quality of the slurry is ensured, and the performance of the slurry is improved. The main material comprises an active material, and the auxiliary material comprises a conductive agent and an adhesive, so that the slurry is prepared by mixing and dispersing the main material and the auxiliary material together with a solvent.
In addition, another object of the present invention is to provide a battery slurry processing system including a first circulation tank, a disperser, and a second circulation tank;
the liquid inlet and outlet of the disperser are respectively connected with the first circulating tank and the second circulating tank, and the top of the disperser is provided with a feed inlet for entering main materials and auxiliary materials;
the first circulation tank can convey the solvent to the disperser, the disperser can continuously mix and disperse the solvent, the main material and the auxiliary material into a mixed solution, and the mixed solution circularly flows in the first circulation tank and the disperser and is mixed and dispersed with the main material and the auxiliary material for a plurality of times to prepare the pre-slurry;
the pre-slurry is capable of circulating a plurality of times between the first circulation tank, the disperser, the second circulation tank, the disperser, and the first circulation tank in order to convert the pre-slurry into slurry.
Further, the dispersing device is rotationally provided with a dispersing shaft, the periphery at the top of the dispersing shaft is provided with a plurality of dispersing pieces, and the dispersing pieces are arranged at intervals in the axial direction of the dispersing shaft and the circumferential direction of the dispersing shaft.
Further, the bottom of dispersion axle is equipped with a plurality of stirring pieces that follow self circumference interval arrangement.
Further, the device also comprises a finished product tank connected with the second circulation tank and used for receiving the slurry, and an active material tank, a conductive agent roller and an adhesive tank which are used for feeding the feed port.
According to the battery slurry processing system, the solvent, the main materials and the auxiliary materials can be mixed and dispersed into the mixed solution through the first circulating tank, the disperser and the second circulating tank, the mixed solution is converted into the prefabricated slurry, and the prefabricated slurry is circularly converted into the slurry for many times among the first circulating tank, the disperser and the second circulating tank, so that the slurry homogenizing efficiency is improved, and the slurry processing efficiency is improved.
In addition, the dispersing tablets on the dispersing shaft are beneficial to improving the dispersing and mixing effect between the main materials, the auxiliary materials and the solvent. The stirring piece has a simple structure, is easy to process and mold, and can improve the mixing and dispersing efficiency by being matched with the dispersing piece. The finished product tank is convenient for collecting and discharging the slurry, and the active material tank, the conductive agent roller and the adhesive tank are beneficial to inputting main materials and auxiliary materials.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a slurry processing system according to a second embodiment of the present invention;
fig. 2 is a schematic view of a part of a disperser according to a second embodiment of the invention.
Reference numerals illustrate:
1. a first circulation tank; 2. a second circulation tank; 3. a disperser; 301. a feeding bin; 302. a dispersion shaft; 302. a dispersible tablet; 304. stirring sheets; 4. an active material tank; 5. a conductive agent tank; 6. an adhesive can; 7. an output main path; 701. an output branch; 8. a first pipeline; 801. a first liquid outlet pipe; 802. a second liquid outlet pipe; 9. a second pipeline; 10. a finished product tank; 11. a solvent tank; 12. a fourth pipeline; 1201. a first liquid inlet pipe; 1202. a second liquid inlet pipe; 13. and a third pipeline.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be noted that, if terms indicating an azimuth or a positional relationship such as "upper", "lower", "inner", "back", and the like are presented, they are based on the azimuth or the positional relationship shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
The embodiment relates to a battery paste processing method, which comprises the following steps:
continuously adding main materials and auxiliary materials into the solvent circularly flowing on the first path, mixing and dispersing the solvent, the main materials and the auxiliary materials to obtain a dispersion solution, flowing the dispersion solution into the first path, and mixing and dispersing the dispersion solution with the main materials and the auxiliary materials in each circularly flowing process to obtain the prefabricated slurry.
The prefabricated slurry circularly flows between the first path and the second path for multiple times, the prefabricated slurry in the first path flows into the second path after being mixed and dispersed, the prefabricated slurry in the second path flows into the first path after being mixed and dispersed, and the prefabricated slurry after multiple times of circulation is converted into slurry.
According to the battery slurry processing method, the main material and the auxiliary material are added into the solvent which circularly flows on the first path and are mixed and dispersed to obtain the dispersion solution, the dispersion solution flows into the first path and is mixed and dispersed with the main material and the auxiliary material for multiple times in the process of circularly flowing, so that the uniformity of the prefabricated slurry is improved, and the mixing and dispersing treatment is performed in the process of circularly flowing between the first path and the second path for multiple times through the prefabricated slurry, so that the uniformity of the slurry and the slurry homogenizing efficiency are improved, and the productivity of the slurry is improved.
In this embodiment, the main material includes an active material, and the auxiliary material includes a conductive agent and an adhesive. In specific implementation, when preparing the positive electrode slurry, the solvent may be N-methyl pyrrolidone, the active material includes lithium iron phosphate, lithium nickel cobalt manganate, etc., the conductive agent is preferably powdered conductive carbon black, and the binder is preferably powdered polyvinylidene fluoride. When preparing the cathode slurry, the solvent is water, the active material comprises graphite, and the conductive agent is preferably powdery conductive carbon black. The binder is preferably sodium carboxymethylcellulose powder in powder form.
In this embodiment, the first path may be formed between the solvent storage device and the dispersing device, where the solvent storage device contains the solvent, and the solvent can be input into the dispersing device and then flow back to the solvent storage device via the dispersing device, so as to implement the circulating flow of the solvent. The dispersing device can mix and disperse the flowing solvent and the main materials and auxiliary materials which are blanked into the mixing and dispersing device 3, so that a dispersing solution is prepared, and the dispersing solution flows back to the solvent storage device.
Then the dispersion solution and the solvent flow into the dispersion device again, the secondary and the main materials and the auxiliary materials are mixed and dispersed in the dispersion device, and then flow back to the solvent storage device, so that the dispersion solution and the solvent circularly flow between the dispersion device and the solvent storage device until the main materials and the auxiliary materials finish feeding, and the prefabricated slurry is prepared.
In the embodiment, the solvent, the main material and the auxiliary materials in the circulating flow are mixed and dispersed for multiple times, so that the uniformity of the prefabricated slurry is improved, and the uniformity and the processing efficiency of the slurry are improved.
As a preferred embodiment, the second path in this embodiment is provided between the dispersing device and the slurry transfer device. The prefabricated slurry in the solvent storage device flows into the dispersing device, after the dispersing device disperses the prefabricated slurry for the first time, the prefabricated slurry is conveyed to the slurry transfer device, the slurry transfer device retransmits the prefabricated slurry to the dispersing device again, after the prefabricated slurry is dispersed for the second time by the dispersing device, the prefabricated slurry flows into the solvent storage device, and then the prefabricated slurry flows into the slurry transfer device after the prefabricated slurry is dispersed for the third time by the dispersing device again, and the prefabricated slurry circulates in the way.
The prefabricated slurry is conveyed between the solvent storage device and the slurry transfer device in a dispersing device, so that the prefabricated slurry flows in a double-circulation mode between the slurry storage device and the slurry transfer device, and the efficiency and uniformity of conversion from the prefabricated slurry to the slurry are improved.
During implementation, the solvent storage device and the slurry transfer device can both adopt a circulating tank, and the dispersing device can adopt the high-speed disperser 3, so that the arrangement and implementation are convenient, and the using effect is good.
Preferably, the slurry processing method in this embodiment further includes detecting a performance parameter of the slurry, and outputting the slurry and performing defoaming treatment when the performance parameter is qualified. In specific implementation, the performance parameters of the slurry include the viscosity of the slurry and the content of solid materials, and the stability of the slurry is improved by defoaming treatment. Thus, the performance of the slurry can be improved, and the slurry has good reference value.
For example, the slurry transfer device outputs slurry to the slurry tank, and defoaming is performed by evacuating the slurry tank. Thus, the slurry collecting device is beneficial to slurry collection and is beneficial to improving the defoaming effect. In addition, the number of times the pre-slurry circulates between the first path and the second path, N, satisfies: N.ltoreq.N.ltoreq.8, for example, the number of times of circulation may be five times, six times, seven times or eight times, etc. I.e. the number of times the pre-slurry flows through the dispersing device may be five, six, seven or eight. The setting of the circulating flow times is favorable for ensuring the processing effect of the slurry.
In addition, the circulation flow time of the pre-slurry is 50 minutes to 60 minutes, for example, the circulation flow time can be 50 minutes, 55 minutes, 60 minutes or the like, and the circulation flow time can be set according to specific use requirements. In addition, in order to improve the processing accuracy of the slurry, the slurry is subjected to a solvent wetting treatment before the use of the first path.
The slurry processing method in the embodiment can process the anode slurry and the cathode slurry respectively, is beneficial to improving the uniformity of the slurry and the processing efficiency, and has better popularization significance. In addition, the processing steps of the processing method are simpler, compared with the traditional homogenization process with the time of about 300min, the processing method in the embodiment only needs about 95min, thereby saving manpower, simplifying the homogenization step, reducing the volatile error points in the production and manufacturing process, and greatly improving the homogenization efficiency and the productivity.
Example two
The present embodiment relates to a battery paste processing system including, as shown in fig. 1, a first circulation tank 1, a disperser 3, and a second circulation tank 2. The liquid inlet and outlet of the disperser 3 are respectively connected with the first circulating tank 1 and the second circulating tank 2, and the top of the disperser 3 is provided with a feed inlet for the main material and auxiliary material to enter.
The first circulation tank 1 can convey the solvent to the disperser 3, and the disperser 3 can continuously mix and disperse the solvent, the main material and the auxiliary material into a mixed solution, and the mixed solution circularly flows in the first circulation tank 1 and the disperser 3 and is mixed and dispersed with the main material and the auxiliary material for a plurality of times to prepare the prefabricated slurry. The pre-slurry can be circulated between the first circulation tank 1, the disperser 3, the second circulation tank 2, the disperser 3, and the first circulation tank 1 in this order a plurality of times to convert the pre-slurry into slurry.
Based on the above overall description, the first circulation tank 1 corresponds to the solvent storage device in the first embodiment, the disperser 3 corresponds to the dispersing device in the first embodiment, and the second circulation tank 2 corresponds to the slurry transfer device in the first embodiment. The disperser 3 may be a high-speed disperser 3 in the prior art, and the first circulation tank 1 and the second circulation tank 2 may be constructed in the prior art.
In a specific structure, the first liquid outlet pipe 801 of the first circulation tank 1 and the second liquid outlet pipe 802 of the second circulation tank 2 are connected to the disperser 3 via the same first pipe 8, and the first liquid inlet pipe 1201 of the first circulation tank 1 and the second liquid inlet pipe 1202 of the second circulation tank 2 are connected to the disperser 3 via the same second pipe 9. Control valves are arranged on the first liquid outlet pipe 801, the second liquid outlet pipe 802, the first liquid inlet pipe 1201 and the second liquid inlet pipe 1202.
The processing system in this embodiment further includes an active material tank 4 for feeding to the feed port, a conductive agent roller, and an adhesive tank 6. The top of the disperser 3 is provided with a feeding bin 301 connected with a feeding port, and the active material tank 4, the conductive agent tank 5 and the adhesive tank 6 are respectively converged on an output main path 7 through output branches 701 and convey materials into the feeding bin 301 through the output main path 7. Locate spiral ejection of compact structure in the feeding storehouse 301, can be with continuous equivalent input disperser 3 of main material and auxiliary material to do benefit to and improve and mix the dispersion effect, and then improve the homogeneity of prefabrication thick liquids. Wherein, each output pipeline is provided with a control valve.
To supply solvent into the first circulation tank 1, the processing system in this embodiment further comprises a solvent tank 11, a finishing tank 10 for receiving slurry, connected to the second circulation tank 2. The solvent tank 11 delivers solvent to the first circulation tank 1 through a third line 13, and the second circulation tank 2 delivers slurry to the final tank 10 through a fourth line 12. Control valves are arranged on the third pipeline 13 and the fourth pipeline 12.
As a preferred embodiment, as shown in fig. 2, the disperser 3 is rotatably provided with a dispersing shaft 302, the outer periphery of the top of the dispersing shaft 302 is provided with a plurality of dispersing pieces 302, and the plurality of dispersing pieces 302 are arranged at intervals in both the axial direction of the dispersing shaft 302 and the circumferential direction of the dispersing shaft 302. The dispersion sheet 302 on the dispersion shaft 302 is advantageous in improving the dispersion mixing effect between the main material and the auxiliary material and the solvent.
Further, the bottom of the dispersing shaft 302 is provided with a plurality of stirring sheets 304 arranged at intervals along the circumferential direction of the dispersing shaft, the stirring sheets 304 are simple in structure and easy to process and shape, and the mixing and dispersing efficiency can be improved by matching with the dispersing sheets 302. Preferably, the stirring blade 304 is disposed obliquely downward corresponding to the dispersing shaft 302, and the free end of the stirring blade 304 is formed with a beveled edge, which is advantageous for further improving the dispersing and stirring effect of the stirring blade 304 on the slurry.
In the slurry processing system of this embodiment, the solvent in the solvent tank 11 is first added to the first circulation tank 1, and then the solvent is subjected to a single circulation flow between the disperser 3 and the first circulation tank 1 (single circulation process: first circulation tank 1→disperser 3→first circulation tank 1), for a circulation time of 5 minutes, so as to wet the piping therebetween.
The main material and the auxiliary material slowly fall down together and are added into the disperser 3, in the process of falling powder, the solvent does not stop in the disperser 3 and the first circulating tank 1 to carry out single circulation flow, the main material and the auxiliary material are continuously taken out of the disperser 3 and dispersed in the solvent, and the prefabricated slurry is prepared after the main material and the auxiliary material are added.
The second circulation tank 2 channel is opened, so that the prefabricated slurry is subjected to double circulation among the disperser 3, the first circulation tank 1 and the second circulation tank 2 (a complete double circulation process: the first circulation tank 1, the disperser 3, the second circulation tank 2, the disperser 3 and the first circulation tank 1), the double circulation is performed for about 8 times, the time is about 60 minutes, and finally the slurry is injected into the second circulation tank 2.
And detecting and confirming performance parameters such as viscosity of the slurry, content of solid materials and the like, when the performance parameters are qualified, pumping the slurry in the second circulation tank 2 into the finished product tank 10, vacuumizing the finished product tank 10 to remove bubbles for 30min, and finally discharging.
The slurry processing system in the embodiment can process the positive electrode slurry and the negative electrode slurry respectively, has better processing efficiency, is favorable for improving the slurry performance, and has better practicability.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A battery paste processing method, characterized by comprising the following steps:
continuously adding main materials and auxiliary materials into a solvent which circularly flows on a first path, mixing and dispersing the solvent, the main materials and the auxiliary materials to obtain a dispersion solution, and enabling the dispersion solution to flow into the first path and be mixed and dispersed with the main materials and the auxiliary materials in each circulating flow process to obtain a prefabricated slurry;
the prefabricated slurry flows circularly between the first path and the second path for multiple times, the prefabricated slurry in the first path flows into the second path after being mixed and dispersed, the prefabricated slurry in the second path flows into the first path after being mixed and dispersed, and the prefabricated slurry after multiple times of circulation is converted into slurry.
2. The battery paste processing method according to claim 1, wherein:
and detecting the performance parameters of the slurry, and outputting the slurry and performing defoaming treatment when the performance parameters are qualified.
3. The battery paste processing method according to claim 2, wherein:
the performance parameters of the slurry comprise the viscosity of the slurry and the content of solid materials; and/or the number of the groups of groups,
the slurry is output to a slurry tank, and defoaming is performed by vacuumizing the slurry tank.
4. The battery paste processing method according to claim 1, wherein:
the number of times of circulation of the pre-slurry between the first path and the second path N is as follows: n is more than or equal to 5 and less than or equal to 8; and/or the number of the groups of groups,
the circulation flow time of the pre-slurry is 50-60 minutes.
5. The battery paste processing method according to claim 1, wherein:
the first path is wet treated with the solvent prior to use.
6. The battery paste processing method according to any one of claims 1 to 5, wherein:
the main material comprises an active material, and the auxiliary material comprises a conductive agent and an adhesive.
7. A battery paste processing system, characterized in that:
comprises a first circulating tank, a disperser and a second circulating tank;
the liquid inlet and outlet of the disperser are respectively connected with the first circulating tank and the second circulating tank, and the top of the disperser is provided with a feed inlet for entering main materials and auxiliary materials;
the first circulation tank can convey the solvent to the disperser, the disperser can continuously mix and disperse the solvent, the main material and the auxiliary material into a mixed solution, and the mixed solution circularly flows in the first circulation tank and the disperser and is mixed and dispersed with the main material and the auxiliary material for a plurality of times to prepare the pre-slurry;
the pre-slurry is capable of circulating a plurality of times between the first circulation tank, the disperser, the second circulation tank, the disperser, and the first circulation tank in order to convert the pre-slurry into slurry.
8. The battery paste processing system of claim 7, wherein:
the dispersing device is characterized in that a dispersing shaft is rotationally arranged in the dispersing device, a plurality of dispersing pieces are arranged on the periphery of the top of the dispersing shaft, and the dispersing pieces are arranged at intervals in the axial direction of the dispersing shaft and the circumferential direction of the dispersing shaft.
9. The battery paste processing system of claim 8, wherein:
the bottom of dispersion axle is equipped with a plurality of stirring pieces of arranging along self circumference interval.
10. The battery paste processing system of any of claims 7 to 9, wherein:
the device also comprises a finished product tank connected with the second circulation tank and used for receiving the slurry, and an active material tank, a conductive agent roller and an adhesive tank which are used for feeding the feed port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311277469.5A CN117181084A (en) | 2023-09-28 | 2023-09-28 | Battery paste processing method and processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311277469.5A CN117181084A (en) | 2023-09-28 | 2023-09-28 | Battery paste processing method and processing system |
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