Method and equipment for preparing lithium battery ceramic diaphragm powder with dispersed doping to improve particle size

Abstract

The present disclosure provides a method and equipment for producing lithium battery ceramic diaphragm powder with improved particle size by dispersed doping. The above-mentioned method for producing lithium battery ceramic diaphragm powder based on improved particle size by dispersed doping includes conveying a first raw material to a sand mill assembly to obtain a first powder; performing a replica grinding detection operation on the first powder; the replica grinding detection operation includes: detecting the first powder to obtain a first particle size parameter; judging whether the first particle size parameter is greater than a preset particle size parameter; if the first particle size parameter is greater than the preset particle size parameter, conveying the first powder to a powder buffer tank to form a second powder, and dispersing and doping the second raw material with the second powder according to a dynamic doping ratio, so that the second powder can enter the sand mill assembly for grinding together with the second raw material, so that the raw material of the previous process can be ground in time, and the material after the raw material is ground can enter the equipment of the next process, thereby reducing the impact of repeated grinding of the first powder on the beat and efficiency of the production line.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery diaphragm preparation, and in particular to a method and equipment for preparing lithium battery ceramic diaphragm powder with dispersed doping and improved particle size. Background Art

[0002] With the rapid development of the lithium battery industry, the demand for lithium battery separators in the industry has gradually increased. Lithium battery separators are made by coating slurry on a substrate, and the slurry is mainly prepared by mixing powder and binder. Among them, the particle size of the powder will directly affect the coating effect of the slurry. The particle size of general lithium battery separator powder needs to be controlled below 20μm. However, due to the stable structure and hard texture of ceramic materials, when grinding them to make lithium battery ceramic separator powder, the particle size of some or batches of powder in the lithium battery ceramic separator powder will still be greater than 20μm. At this time, in order to reduce equipment replacement or increased costs, most factories usually use the original equipment to repeatedly grind the lithium battery ceramic separator powder, which will cause the raw materials of the previous process to be unable to be ground in time, and then cause the equipment of the next process to stop working due to no material processing, affecting the beat and efficiency of the entire production line. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method and equipment for producing lithium battery ceramic diaphragm powder by dispersed doping to improve particle size, which can stabilize the rhythm and efficiency of the lithium battery ceramic diaphragm powder grinding production line.

[0004] The purpose of this disclosure is achieved through the following technical solutions:

[0005] A method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size, comprising:

[0006] Conveying a first raw material to a sand mill assembly to obtain a first powder;

[0007] Performing a replica grinding test operation on the first powder;

[0008] The replica grinding detection operation includes:

[0009] detecting the first powder to obtain a first particle size parameter;

[0010] Determining whether the first particle size parameter is greater than a preset particle size parameter;

[0011] If the first particle size parameter is greater than the preset particle size parameter, the first powder is transported to a powder buffer tank to form a second powder;

[0012] Dispersing and doping the second raw material and the second powder according to a dynamic doping ratio to obtain a doping material;

[0013] conveying the doping material to the sanding assembly to grind the doping material;

[0014] Wherein, the dynamic doping ratio is obtained according to the following steps:

[0015] Obtaining a feeding rate of the second raw material;

[0016] Obtaining a discharge rate of the second powder;

[0017] Performing powder speed ratio processing on the feeding rate and the discharging rate to obtain a doping flow rate ratio;

[0018] Detecting whether the doping flow rate ratio is less than or equal to a preset doping flow rate ratio;

[0019] When the doping flow rate ratio is less than or equal to the preset doping flow rate ratio, the feeding rate of the second raw material is increased and the discharging rate of the second powder is reduced.

[0020] In one embodiment, the step of conveying the doping material to the sand mill assembly to grind the doping material further comprises:

[0021] driving the sand mill assembly to grind the doping material to obtain a third powder;

[0022] The third powder is used as a new first powder and returned to the replica grinding and testing operation step.

[0023] In one embodiment, the determining whether the first particle size parameter is greater than a preset particle size parameter further includes:

[0024] If the first particle size parameter is less than or equal to the preset particle size parameter, the first powder is exported.

[0025] In one embodiment, the first powder is transported into a powder buffer tank to form a second powder, and then the method further includes:

[0026] According to the cumulative opening time of the one-way valve, the duration of powder passage is obtained;

[0027] Detecting whether the powder passage duration is greater than or equal to a preset passage duration;

[0028] If the powder passage duration is greater than or equal to the preset passage duration, the feed rate and the discharge rate are increased simultaneously.

[0029] In one embodiment, the step of detecting whether the powder passage duration is greater than or equal to the preset passage duration further includes:

[0030] If the powder passage duration is less than the preset passage duration, obtaining the cumulative opening statistics times according to the cumulative times the one-way valve is opened;

[0031] Detecting whether the cumulative number of start statistics is greater than or equal to a preset cumulative number;

[0032] If the cumulative number of opening statistics is greater than or equal to the preset cumulative number, the working power of the feed diaphragm pump is balanced.

[0033] In one embodiment, the step of dispersing and doping the second raw material and the second powder according to a dynamic doping ratio to obtain a doped material includes:

[0034] delivering a first preset amount of the second raw material to a dispersed storage tank;

[0035] The second preset amount of the second powder is delivered to the dispersion tank in multiple times to disperse and dope the second raw material and the second powder to obtain the doped material; wherein the first preset amount is greater than the second preset amount.

[0036] In one embodiment, the step of conveying the doping material to the sand mill assembly to grind the doping material further comprises:

[0037] Calculating the difference between the first particle size parameter and the preset particle size parameter to obtain a current particle size difference;

[0038] Detecting whether the current particle size difference is greater than a preset particle size difference;

[0039] If the current particle size difference is greater than the preset particle size difference, a power increase signal is sent to the sanding assembly.

[0040] In one embodiment, the detecting whether the current particle size difference is greater than the preset particle size difference further includes:

[0041] If the current particle size difference is less than or equal to the preset particle size difference, the sanding assembly is driven to maintain the current power operation.

[0042] A powder production device using the method for producing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size as in any of the above embodiments, comprising:

[0043] decentralized storage tanks;

[0044] A sand mill component, the sand mill component is connected to the dispersion storage tank, and the sand mill component is used to grind the first raw material or the doping material;

[0045] A powder inspection tank, wherein the feeding end of the powder inspection tank is connected to the discharging end of the sand mill assembly; the powder inspection tank is used to store the first powder for testing; the powder inspection tank is respectively provided with a discharging port and a return port, and the discharging port is used to guide out the first powder;

[0046] A powder buffer tank, wherein the feeding end of the powder buffer tank is connected to the return port, and the powder buffer tank is used to buffer the second powder; the discharging end of the powder buffer tank is connected to the dispersion storage tank, and the second raw material and the second powder are dispersed and doped in the dispersion storage tank.

[0047] In one embodiment, the sand mill assembly includes at least two sand mills connected to each other, and the dispersion storage tank is connected to each of the sand mills respectively; the powder inspection tank is connected to the dispersion storage tank and each of the sand mills respectively.

[0048] Compared with the prior art, the present invention has at least the following advantages:

[0049] The above-mentioned method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size, by conveying the first raw material to the sand mill component, so that the sand mill component can grind the first raw material into a first powder, after detecting the first powder, the particle size of the first powder can be collected to obtain a first particle size parameter, and the first particle size parameter can reflect the particle size of the first powder, that is, it can indicate the grinding effect of the sand mill component, and then by judging whether the first particle size parameter is greater than the preset particle size parameter, it can be reflected whether the particle size of the first powder meets the standard, if the first particle size parameter is greater than the preset particle size parameter, it can be determined that the particle size of the first powder deviates from the standard, at this time, the first powder is conveyed to the powder buffer tank to form a second powder, and the second raw material and the second powder are dispersedly doped according to the dynamic doping ratio, so that the second powder can enter the sand mill component together with the second raw material for grinding, so that the raw material of the previous process can be ground in time, and the material after the raw material is ground can enter the equipment of the next process, thereby reducing the impact of repeated grinding of powder on the beat and efficiency of the production line. At the same time, according to this method, raw materials of different batches and textures can be ground by the same sand mill component, so there is no need to replace or install new grinding equipment, thus reducing the investment in production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1This is a flow chart of a method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size according to an embodiment of the present disclosure;

[0052] Figure 2 for Figure 1 The flowchart of the replica grinding and detection operation in the method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size is shown;

[0053] Figure 3 It is a schematic structural diagram of a powder production device according to another embodiment of the present disclosure.

[0054] Reference numerals: 10, powder production equipment; 100, dispersion storage tank; 200, sand mill assembly; 210, sand mill; 300, powder inspection tank; 400, powder buffer tank; 410, feed diaphragm pump. DETAILED DESCRIPTION

[0055] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0056] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0058] The present disclosure provides a method for producing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size, including conveying a first raw material to a sand mill component to obtain a first powder; performing a replica grinding detection operation on the first powder; the replica grinding detection operation includes: detecting the first powder to obtain a first particle size parameter; judging whether the first particle size parameter is greater than a preset particle size parameter; if the first particle size parameter is greater than the preset particle size parameter, conveying the first powder to a powder buffer tank to form a second powder; dispersing and doping a second raw material and a second powder according to a dynamic doping ratio to obtain a doping material; conveying the doping material to the sand mill component to grind the doping material.

[0059] It can be understood that by conveying the first raw material to the sand mill assembly, the sand mill assembly can grind the first raw material into the first powder. After detecting the first powder, the particle size of the first powder can be collected to obtain the first particle size parameter. The first particle size parameter can reflect the particle size of the first powder, that is, it can indicate the grinding effect of the sand mill assembly. Then, by judging whether the first particle size parameter is greater than the preset particle size parameter, it can reflect whether the particle size of the first powder meets the standard. If the first particle size parameter is greater than the preset particle size parameter, it can be determined that the particle size of the first powder deviates from the standard. At this time, the first powder is conveyed to the powder buffer tank to form the second powder, and the second raw material and the second powder are dispersed and doped according to the dynamic doping ratio, so that the second powder can enter the sand mill assembly together with the second raw material for grinding, so that the raw material of the previous process can be ground in time, and the material after the raw material is ground can enter the equipment of the next process, thereby reducing the impact of repeated grinding of powder on the beat and efficiency of the production line. At the same time, according to this method, raw materials of different batches and textures can be ground through the same sand mill assembly, so that there is no need to replace or install new grinding equipment, reducing the investment in production costs.

[0060] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0061] like Figure 1 and Figure 2 As shown, a method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size in one embodiment includes some or all of the following steps.

[0062] S100, conveying the first raw material to the sand milling assembly to obtain a first powder. In this embodiment, the first raw material is a ceramic material, and the first raw material will be able to present a first powder in a granular form after being ground by the sand milling assembly, and the particle size of the first powder is more in line with the particle size requirements of diaphragm production. The specific sand milling assembly can be a ball mill, of course, this is not limited here, and those skilled in the art can also make other choices according to needs.

[0063] S200, perform a replica grinding detection operation on the first powder. In this embodiment, by performing a replica grinding detection operation on the first powder, the particle size of the first powder can be collected, and the grinding effect of the sand mill component can be reflected according to the particle size of the first powder, that is, it indicates whether the particle size of the first powder after being ground by the sand mill component meets the particle size requirement of diaphragm production, thereby determining whether the first powder needs to be ground again. Among them, by performing a replica grinding detection operation on the first powder, the first powder that meets the diaphragm production requirement is directly exported, and the first powder that meets the diaphragm production requirement is transported to the powder buffer tank to form a second powder, and the second powder is ground again by the sand mill component, that is, there are at least two different operation processes for the replica grinding detection operation.

[0064] Replica grinding inspection operations include:

[0065] S210, detect the first powder to obtain a first particle size parameter. In this embodiment, a portion of the first powder can be selected by random sampling. Since the portion of the first powder is randomly selected, the particle size of the portion of the first powder can be detected, and the particle size of the portion of the first powder can reflect the particle size of the first powder as a whole, that is, the first particle size parameter is obtained. Specifically, the particle size of the portion of the first powder is obtained by taking the average value of the maximum powder particle size and the minimum powder particle size in the portion of the first powder, thereby reducing the processing process of each powder particle size data in the portion of the first powder, so that a large amount of complex powder particle size data is converted into a simple first particle size parameter, thereby improving the detection efficiency.

[0066] S220, judging whether the first particle size parameter is greater than the preset particle size parameter. In this embodiment, the preset particle size parameter is a particle size parameter that meets the production requirements, and the preset particle size parameter is set according to industry experience. By comparing the first particle size parameter with the preset particle size parameter, the deviation between the first particle size parameter and the preset particle size parameter can be reflected, that is, whether the first particle size parameter meets the particle size requirement required for membrane production.

[0067] S230. If the first particle size parameter is greater than the preset particle size parameter, the first powder is transported to the powder buffer tank to form a second powder. In this embodiment, the first particle size parameter is greater than the preset particle size parameter, indicating that the particle size of the first powder is greater than the particle size required for membrane production, that is, indicating that the first powder does not meet the membrane production requirements. By transporting the first powder to the powder buffer tank, the part of the first powder that does not meet the membrane production requirements can be separated from the part that has met the requirements, and the part of the first powder that does not meet the membrane production requirements is transported to the powder buffer tank to form a second powder, which means that the second powder needs to be ground again.

[0068] S240, dispersing and doping the second raw material and the second powder according to the dynamic doping ratio to obtain the doped material. In this embodiment, the second raw material is an unground raw material, that is, a newly added raw material, and the second raw material and the first raw material are the same raw material from different batches, so that the second raw material and the second powder are dispersed and doped according to the dynamic doping ratio to obtain the doped material. At this time, the doped material can contain both the second raw material output from the previous process and the second powder, that is, the second raw material and the second powder of the previous process can be transported synchronously, so as to ensure that the second raw material of the previous process is ground in time, thereby improving production efficiency.

[0069] S250, conveying the dopant to the sand mill assembly to grind the dopant. In this embodiment, by conveying the dopant to the sand mill assembly, that is, the second powder is conveyed to the sand mill assembly synchronously with the second raw material of the previous process, the sand mill assembly can grind the second powder while performing the initial grinding of the second raw material, so that the second raw material can enter the sand mill assembly for grinding in time. At the same time, after the second powder is ground by the sand mill assembly, the particle size of the second powder will be closer to the particle size requirement for diaphragm production, so that the equipment of the next process can maintain a working state, which can effectively reduce the impact of repeated grinding of powder on the beat and efficiency of the production line.

[0070] It can be understood that by conveying the first raw material to the sand mill assembly, the sand mill assembly can grind the first raw material into the first powder. After detecting the first powder, the particle size of the first powder can be collected to obtain the first particle size parameter. The first particle size parameter can reflect the particle size of the first powder, that is, it can indicate the grinding effect of the sand mill assembly. Then, by judging whether the first particle size parameter is greater than the preset particle size parameter, it can reflect whether the particle size of the first powder meets the standard. If the first particle size parameter is greater than the preset particle size parameter, it can be determined that the particle size of the first powder deviates from the standard. At this time, the first powder is conveyed to the powder buffer tank to form the second powder, and the second raw material and the second powder are dispersed and doped according to the dynamic doping ratio, so that the second powder can enter the sand mill assembly together with the second raw material for grinding, so that the raw material of the previous process can be ground in time, and the material after the raw material is ground can enter the equipment of the next process, thereby reducing the impact of repeated grinding of powder on the beat and efficiency of the production line. At the same time, according to this method, raw materials of different batches and textures can be ground through the same sand mill assembly, so that there is no need to replace or install new grinding equipment, reducing the investment in production costs.

[0071] Combination Figure 3As shown, usually, in the actual production process, the dynamic doping ratio is adjusted mainly according to factors such as the factory quality of the powder and the output efficiency. For example, when the factory quality of the powder is improved, the average particle size of the doping material after grinding will be smaller. If the proportion of the second powder in the doping material is too high, it will easily lead to a longer grinding time per unit volume of the doping material, which will lead to a decrease in output efficiency and a longer production cycle, which will eventually increase the additional production costs and impose a heavy burden on the enterprise.

[0072] In order to take into account the output efficiency, in one of the embodiments, a first flow meter is provided on the feed pipe of the dispersion tank 100, and the first flow meter is used to measure the flow rate of the second raw material in the feed pipe of the dispersion tank 100; a second flow meter is provided on the connecting pipe between the powder buffer tank 400 and the dispersion tank 100, and the second flow meter is used to measure the flow rate of the second powder in the connecting pipe between the powder buffer tank 400 and the dispersion tank 100.

[0073] The dynamic doping ratio is obtained by some or all of the following steps:

[0074] Obtaining the feeding rate of the second raw material. In this embodiment, the flow rate of the second raw material in the feed pipe of the dispersed storage tank 100 is measured by a first flow meter, so that the feeding rate of the second raw material can be obtained, and then the speed at which the second raw material enters the dispersed storage tank 100 can be obtained, and the volume of the second raw material entering the dispersed storage tank 100 within a certain period of time can be reflected.

[0075] Obtaining the discharge rate of the second powder. In this embodiment, the flow rate of the second powder entering the dispersion tank 100 from the return port is measured by a second flow meter, so that the discharge rate of the second powder can be obtained, and then the speed at which the second powder enters the dispersion tank 100 can be obtained, and the volume of the second powder entering the dispersion tank 100 within a certain period of time can be reflected.

[0076] The feed rate and the discharge rate are processed by powder speed ratio to obtain the doping flow rate ratio. In this embodiment, the feed rate and the discharge rate are processed by powder speed ratio, that is, by calculating the ratio of the feed rate to the discharge rate, the doping flow rate ratio (V 入料 / V 出料 ), the doping flow rate ratio can reflect the ratio of the second raw material entering the dispersion tank 100 to the second powder entering the dispersion tank 100.

[0077] Detect whether the doping flow rate ratio is less than or equal to the preset doping flow rate ratio. The preset doping flow rate ratio is the ratio of the feed rate to the discharge rate when the factory quality and output efficiency of the powder meet the standards. By comparing the doping flow rate ratio with the preset doping flow rate ratio, it can reflect the difference between the current ratio of the second raw material entering the dispersion tank 100 and the second powder entering the dispersion tank 100 compared to the ratio when the factory quality and output efficiency of the powder meet the standards. In one embodiment, the preset doping flow rate ratio is 9, which is of course not a limitation here.

[0078] When the doping flow rate ratio is less than or equal to the preset doping flow rate ratio, the feed rate is increased and the discharge rate is decreased. In the present embodiment, the doping flow rate ratio is less than or equal to the preset doping flow rate ratio, indicating that the current proportion of the second raw material in the dispersion tank 100 is less than or equal to the proportion of the second raw material when the factory quality of the powder and the output efficiency meet the standards, indicating that the proportion of the second powder in the doping material is too high, that is, the doping material needs to be ground for a longer time after being ground by the sand mill assembly 200. By increasing the feed rate and decreasing the discharge rate, the second raw material entering the dispersion tank 100 can be increased and the second powder entering the dispersion tank 100 can be reduced at the same time, thereby rapidly reducing the proportion of the second powder in the doping material formed by the dispersed doping of the second raw material and the second powder, reducing the time required for grinding per unit volume of the doping material, and improving the factory quality of the powder while improving the output efficiency.

[0079] It can be understood that by obtaining the feeding rate of the second raw material and the discharging rate of the second powder, the volume of the second raw material and the volume of the second powder entering the dispersion tank 100 in the same time period can be obtained at the same time, and then the proportion of the second powder in the doping material can be obtained. The doping flow rate ratio is less than or equal to the preset doping flow rate ratio, indicating that the proportion of the second powder in the dispersion tank 100 in the doping material is higher than the proportion of the second powder when the powder factory quality and the output efficiency are up to standard. By increasing the feeding rate and reducing the discharging rate, the second raw material entering the dispersion tank 100 can be increased and the second powder entering the dispersion tank 100 can be reduced in the same time, thereby rapidly reducing the proportion of the second powder in the doping material formed by the dispersed doping of the second raw material and the second powder, reducing the time required for grinding a unit volume of the doping material, and improving the output efficiency while improving the factory quality of the powder.

[0080] In one of the embodiments, when the doping flow rate ratio is greater than the preset doping flow rate ratio, the feed rate is reduced and the discharge rate is increased. In this embodiment, the doping flow rate ratio is greater than the preset doping flow rate ratio, indicating that the current proportion of the second raw material in the dispersion tank 100 is greater than the proportion of the second raw material when the powder factory quality and output efficiency are up to standard. At this time, the consumption of the second powder is relatively small, and the second powder is easy to accumulate in the powder buffer tank 400. By reducing the feed rate and increasing the discharge rate, the second raw material entering the dispersion tank 100 can be reduced and the second powder entering the dispersion tank 100 can be increased at the same time, thereby rapidly increasing the proportion of the second powder in the doping material formed by the dispersed doping of the second raw material and the second powder, increasing the consumption of the second powder to reduce the powder accumulation in the powder buffer tank 400.

[0081] Combination Figure 3 As shown, usually, when the accumulated second powder appears, that is, the number of times the powder with a particle size larger than the preset parameter appears is too many, that is, the volume of the first powder entering the powder buffer tank 400 is larger than the volume of the second powder output from the powder buffer tank 400, which causes a sudden increase in the powder in the powder buffer tank 400, and the powder buffer tank 400 is prone to overload, powder overflow, and the risk of dust explosion.

[0082] In order to reduce the occurrence of overload of the powder buffer tank 400, in one embodiment, a one-way valve is further provided at the return port of the powder inspection tank 300, and a measuring meter is provided on the one-way valve. The measuring meter is used to count the cumulative time and cumulative number of times the one-way valve is opened. When the first powder passes through the return port, the one-way valve opens, and when the first powder does not pass through the return port, the one-way valve closes.

[0083] The first powder is transported into the powder buffer tank 400 to form a second powder, and then the method further includes:

[0084] The powder passage duration is obtained according to the accumulated time of the one-way valve being open. In this embodiment, the accumulated time of the one-way valve being open is counted by a measuring meter. Since the first powder enters the powder buffer tank 400 through the return port when the one-way valve is open, the accumulated time of the first powder entering the powder buffer tank 400 through the one-way valve can be obtained, that is, the powder passage duration. The powder passage duration can reflect the volume of the first powder entering the powder buffer tank 400, that is, the volume of the second powder formed by the first powder entering the powder buffer tank 400.

[0085] Detect whether the powder passage duration is greater than or equal to the preset passage duration. In this embodiment, the preset passage duration is the time when the powder buffer tank 400 is just overloaded, which is set according to industry experience. By comparing the powder passage duration with the preset passage duration, it is possible to reflect the difference between the volume of the first powder entering the powder buffer tank 400 and the volume of the powder in the powder buffer tank 400 when overloaded, that is, to reflect the difference between the volume of the second powder continuously formed in the powder buffer tank 400 and the volume of the powder in the powder buffer tank 400 when overloaded.

[0086] If the duration of powder passage is greater than or equal to the preset duration of passage, the feed rate and the discharge rate are increased at the same time. In this embodiment, the powder passage duration is greater than or equal to the preset duration of passage, indicating that the volume of the first powder entering the powder buffer tank 400 is greater than or equal to the volume of the powder in the powder buffer tank 400 when overloaded, indicating that the volume of the first powder entering the powder buffer tank 400 is too large, and also indicating that the volume of the second powder formed in the powder buffer tank 400 is too large. By increasing the discharge rate, the discharge of the second powder in the powder buffer tank 400 to the dispersion tank 100 can be increased, thereby quickly reducing the second powder in the powder buffer tank 400 and avoiding the occurrence of a sudden increase in the powder in the powder buffer tank 400. Overload. At the same time, increase the feed rate so that the second raw material entering the dispersion tank 100 increases synchronously to reduce the impact on the doping flow rate ratio, that is, reduce the impact on the quality of the powder leaving the factory.

[0087] In one of the embodiments, a feed diaphragm pump 410 is further provided on the connecting pipe between the powder buffer tank 400 and the dispersion storage tank 100, and the return port of the powder inspection tank is connected to the powder buffer tank 400 through the feed diaphragm pump 410. The power of the feed diaphragm pump 410 in pushing the first powder into the powder buffer tank 400 is different from the power of the feed diaphragm pump 410 in pushing the second powder into the dispersion storage tank 100.

[0088] Detect whether the powder passage duration is greater than or equal to the preset passage duration, and then also include:

[0089] If the detected powder passage duration is less than the preset passage duration, the cumulative opening statistics count is obtained according to the cumulative number of times the one-way valve is opened. In this embodiment, the powder passage duration is less than the preset passage duration, and the cumulative number of times the one-way valve is opened is counted by measuring the meter. Since the first powder enters the powder buffer tank 400 through the return port when the one-way valve is opened, the cumulative number of times the first powder enters the powder buffer tank 400 through the one-way valve can be obtained, that is, the cumulative opening statistics count. The cumulative opening statistics count can reflect the volume of the first powder entering the powder buffer tank 400, that is, the volume of the second powder formed by the first powder entering the powder buffer tank 400.

[0090] Check whether the cumulative number of opening statistics is greater than or equal to the preset cumulative number. It can be understood that in this embodiment, the preset cumulative number is the number of times the powder buffer tank 400 is just overloaded, which is set according to industry experience. By comparing the size of the cumulative number of opening statistics and the preset cumulative number, it can reflect the difference between the volume of the first powder entering the powder buffer tank 400 and the volume of the powder in the powder buffer tank 400 when overloaded, that is, it can reflect the difference between the volume of the second powder continuously formed in the powder buffer tank 400 and the volume of the powder in the powder buffer tank 400 when overloaded.

[0091] If the cumulative number of start statistics is greater than or equal to the preset cumulative number, the working power of the feed diaphragm pump 410 is balanced. In this embodiment, if the cumulative number of statistical opening times is greater than or equal to the preset cumulative number of times, it indicates that the volume of the first powder entering the powder buffer tank 400 is greater than or equal to the volume of the powder in the powder buffer tank 400 when overloaded, indicating that the volume of the first powder entering the powder buffer tank 400 is too large, and also indicating that the volume of the second powder formed in the powder buffer tank 400 is too large. By balancing the working power of the feed diaphragm pump 410, the power of the feed diaphragm pump 410 in pushing the first powder into the powder buffer tank 400 is consistent with the power of the feed diaphragm pump 410 in pushing the second powder out of the powder buffer tank 400, that is, the rate at which the first powder enters the powder buffer tank 400 is consistent with the rate at which the second powder enters the dispersion storage tank 100, that is, at the same time, the second powder formed by the first powder entering the powder buffer tank 400 is consistent with the second powder discharged from the powder buffer tank 400 so that the total amount of powder in the powder buffer tank 400 remains unchanged, and ultimately the occurrence of a sudden increase in powder overload in the powder buffer tank 400 can be avoided.

[0092] In one embodiment, if the cumulative number of opening statistics is less than the preset cumulative number, the working power of the feed diaphragm pump 410 is kept unchanged. In this embodiment, the cumulative number of opening statistics is less than the preset cumulative number, indicating that the volume of the first powder entering the powder buffer tank 400 is less than the volume of the powder in the powder buffer tank 400 when overloaded, indicating that the volume of the first powder entering the powder buffer tank 400 is small, indicating that there will be no explosive increase in the buffer tank, and the original working power of the feed diaphragm pump 410 is kept unchanged.

[0093] In one embodiment, S250, the doping material is conveyed to a sand mill assembly to grind the doping material, and then the step further includes:

[0094] S260, driving the sand mill component to grind the dopant to obtain a third powder. In this embodiment, by driving the sand mill component, the grinding component can grind the dopant, that is, grind the second raw material and the second powder in the dopant at the same time, thereby obtaining a third powder. After the second powder is ground by the grinding component, the particle size of the second powder will become smaller, and the particle size of the second raw material will also become smaller after being ground by the grinding component, so that it can be closer to the particle size requirement required for diaphragm production.

[0095] S270, returning the third powder as the new first powder to the replica grinding detection operation step. In this embodiment, by returning the third powder as the new first powder to the replica grinding detection operation step, that is, by performing the replica grinding detection operation on the third powder, the particle size of the third powder can be collected, and the grinding effect of the sand mill assembly can be reflected according to the particle size of the third powder, that is, whether the particle size of the third powder after being ground by the sand mill assembly meets the particle size requirement required for diaphragm production, thereby determining whether the third powder needs to be ground again, so as to further ensure that the particle size of the powder can meet the particle size requirement required for diaphragm production, and ultimately ensure the quality of the produced lithium battery diaphragm.

[0096] It can be understood that the third powder is obtained by grinding the doping material through the sand grinding component, and the third powder is returned to the replica grinding detection operation step as the new first powder, so as to detect the third powder, and it can be obtained whether the particle size of the third powder meets the particle size requirements for diaphragm production, and it can be further confirmed whether the third powder has reached the particle size requirements for diaphragm production, and ultimately ensure the quality of the produced lithium battery diaphragm.

[0097] In one embodiment, S220, determining whether the first particle size parameter is greater than a preset particle size parameter, and then further comprising:

[0098] S221. If the first particle size parameter is less than or equal to the preset particle size parameter, the first powder is exported. In this embodiment, the first particle size parameter is less than or equal to the preset particle size parameter, indicating that the particle size of the first powder is less than or equal to the particle size required for diaphragm production, that is, the first powder has met the requirements for diaphragm production, that is, the first powder does not need to be ground again. In this way, by exporting the first powder after the first particle size parameter is less than or equal to the preset particle size parameter, the first powder can be promptly fed into the equipment of the next process, thereby reducing the occurrence of equipment shutdowns in the next process due to lack of material processing, and stabilizing the beat and efficiency of the entire production line.

[0099] In one embodiment, the first particle size parameter is a median particle size. In this embodiment, by selecting the first particle size parameter as the median particle size, since the median particle size is the average particle size of the first powder, the median particle size can be used to reflect the particle size of the first powder.

[0100] S210, detecting the first powder to obtain a first particle size parameter, including:

[0101] S211, sampling the first powder multiple times to obtain multiple powder samples. In this embodiment, by sampling the first powder multiple times, the number of powder samples can be increased, thereby avoiding experimental deviation caused by too small a number of powder samples.

[0102] S212, obtain the particle size of each powder sample, and calculate the average value to obtain the median particle size. In this embodiment, by obtaining the particle size of each powder sample, a plurality of particle size data can be obtained, each particle size data can reflect the particle size of the corresponding powder sample, and the median particle size can be obtained by calculating the average value of the plurality of particle size data, thereby reflecting the average particle size of the powder sample through the median particle size. Since the powder sample is obtained from the first powder, the median particle size can more accurately reflect the average particle size of the first powder to reduce the detection error. Specifically, the particle size of each powder sample is obtained by calculating the average value of the maximum powder particle size and the minimum powder particle size in the corresponding powder sample, thereby reducing the processing process of each powder particle size data in the corresponding powder sample and improving the detection efficiency.

[0103] Usually, the median particle size is obtained by taking the average value of the particle sizes of each powder sample, that is, at least half of the powders in the first powder have a particle size larger than the median particle size. When the first particle size parameter is less than or equal to the preset particle size parameter, that is, the median particle size is less than or equal to the preset particle size parameter, the closer the median particle size is to the preset particle size parameter, the greater the amount of particles in the first powder whose particle size is larger than the preset particle size parameter. If the first powder is directly put into production, the consistency of the quality of the produced lithium battery separator will be reduced.

[0104] In order to solve the above problem, in one embodiment, S221, if the first particle size parameter is less than or equal to the preset particle size parameter, deriving the first powder specifically includes:

[0105] S221a, if the first particle size parameter is less than or equal to the preset particle size parameter, calculate the difference between the first particle size parameter and the preset particle size parameter to obtain a particle size deviation value;

[0106] S221b, detecting whether the particle size deviation value is less than the insurance deviation value;

[0107] S221c, if the detected particle size deviation value is less than the insurance deviation value, transport the first powder to the sieve plate mechanism;

[0108] S221d, driving the sieve plate mechanism to sieve the first powder to obtain the target powder;

[0109] S221e, equipment for exporting target powder to the next process.

[0110] In this embodiment, by obtaining the difference between the first particle size parameter and the preset particle size parameter, the difference between the first particle size parameter and the preset particle size parameter can be reflected. The insurance deviation value is the difference between the median particle size of the first powder and the preset particle size parameter when the particle size of 90% of the powder in the first powder is less than the preset particle size. By comparing the size of the particle size deviation value and the insurance deviation value, the situation of the amount of particles in the first powder whose particle size is greater than the preset particle size parameter can be reflected. The detection particle size deviation value is less than the insurance deviation value, indicating that the particle size of less than 90% of the powder in the first powder is greater than the preset particle size parameter, that is, indicating that the particle size of more than 10% of the powder in the first powder is greater than the preset particle size parameter. By transporting the first powder to the sieve plate mechanism, the powder with a particle size less than the preset particle size parameter in the first powder can be sieved out by the sieve plate mechanism to obtain the target powder, and finally the target powder is exported to the equipment of the next process to produce lithium battery diaphragms. In this way, the particle size of at least 90% of the target powder will be kept smaller than the preset particle size parameter, that is, at least 90% of the target powder will meet the particle size requirements for diaphragm production, thereby making the quality consistency of the produced lithium battery diaphragm better.

[0111] In one embodiment, S221f, if the detected particle size deviation value is greater than or equal to the insurance deviation value, the first powder is exported to the equipment of the next process. It can be understood that the detected particle size deviation value is greater than or equal to the insurance deviation value, indicating that at least 90% of the powder in the first powder meets the particle size requirement required for diaphragm production, and the first powder is exported to the equipment of the next process to produce lithium battery diaphragms, so that the quality consistency of the produced lithium battery diaphragms is better.

[0112] Usually, after the first powder is screened by the sieve plate mechanism, the first powder is easy to wear the sieve plate mechanism to produce magnetic foreign matter. The magnetic foreign matter enters the production of lithium battery diaphragms, which can easily cause damage to the lithium battery diaphragms and affect product quality.

[0113] In order to solve the above problem, in one embodiment, S221e, the device for exporting the target powder to the next process, previously also includes:

[0114] Step A, obtaining an electromagnetic rod;

[0115] Step B, covering the electromagnetic rod with a polypropylene casing to obtain a magnetic rod;

[0116] Step C, turning on the demagnetizing stick and inserting the demagnetizing stick into the target powder to stir it, so as to demagnetize the target powder;

[0117] Step D: After removing the demagnetizing stick from the target powder, close the demagnetizing stick and perform a cleaning operation.

[0118] In this embodiment, the electromagnetic rod is a cylindrical electromagnet. By covering the electromagnetic rod with a polypropylene shell, the polypropylene shell can be used to protect the electromagnetic rod to obtain a demagnetizing stick. Turning on the demagnetizing stick means connecting the electromagnetic rod to the power supply. At this time, the electromagnetic rod will generate magnetism in the polypropylene shell. The demagnetizing stick is inserted into the target powder and stirred, so that the magnetic foreign matter in the target powder can contact and be adsorbed on the surface of the polypropylene shell of the demagnetizing stick. The polypropylene shell can not only protect the electromagnetic rod, but also prevent the target powder from rubbing against the polypropylene shell to produce new magnetic foreign matter. Thereafter, the demagnetizing stick is taken out of the target powder. Turning off the demagnetizing stick means disconnecting the power supply of the electromagnetic rod. At this time, the magnetic foreign matter adsorbed on the surface of the polypropylene shell of the demagnetizing stick will lose its magnetic effect and fall off, making it easier to clean the demagnetizing stick.

[0119] Usually, in the process of pulling out the demagnetizing stick from the target powder, the magnetic foreign matter adsorbed on the demagnetizing stick will fall back into the target powder under the contact of the target powder, resulting in a decrease in the demagnetizing effect.

[0120] To solve the above problem, in one embodiment, step C, turning on the demagnetizing stick and inserting the demagnetizing stick into the target powder for stirring to demagnetize the target powder, also includes:

[0121] Step C1, obtaining a woolen net bag;

[0122] Step C2: Wrap the magnetic removal stick in a woolen net bag.

[0123] In this embodiment, by covering the magnetic rod with a woolen net bag, the woolen net bag can be inserted into the target powder along with the magnetic rod, and the magnetic foreign matter in the target powder will be embedded in the mesh of the woolen net bag under the action of the magnetic force of the magnetic rod. In this way, when the magnetic rod is pulled out of the target powder, the magnetic foreign matter is bound by the hair on the woolen net bag, so that it is less likely to slide off the magnetic rod, thereby further improving the demagnetization effect.

[0124] In one embodiment, in S240, the second raw material and the second powder are dispersedly doped according to the dynamic doping ratio to obtain the doped material, including:

[0125] S241, delivering a first preset amount of the second raw material to a dispersion storage tank. In this embodiment, the first preset amount is obtained based on the performance of the sand mill assembly being used and industry experience, and by delivering the first preset amount of the second raw material to the dispersion storage tank, the dispersion storage tank can first store a fixed amount of the second raw material, so as to facilitate subsequent dispersion and doping with the second powder according to a dynamic doping ratio.

[0126] S242, conveying the second preset amount of the second powder to the dispersion tank for multiple times to disperse and dope the second raw material and the second powder to obtain the doped material; wherein the first preset amount is greater than the second preset amount. In this embodiment, the second preset amount is obtained based on the performance of the sand mill assembly currently in use and industry experience. By conveying the second preset amount of the second powder to the dispersion tank for multiple times, the second powder is intermittently fed into the dispersion tank to avoid excessive aggregation of the second powder, so that the second powder and the second raw material are evenly dispersed and doped in the dispersion tank, so that the sand mill assembly can fully grind the doped material. At the same time, since the first preset amount is greater than the second preset amount, the amount of the second raw material in the doped material is greater than the amount of the second powder, thereby ensuring that the second raw material of the previous process is ground in time.

[0127] In one embodiment, S250, the doping material is conveyed to a sand mill assembly to grind the doping material, and the process also includes:

[0128] S251, obtaining the difference between the first particle size parameter and the preset particle size parameter to obtain the current particle size difference. In this embodiment, by obtaining the difference between the first particle size parameter and the preset particle size parameter, the deviation between the first particle size parameter and the preset particle size parameter can be obtained, indicating the difference between the particle size of the first powder and the particle size required for the membrane production.

[0129] S252, detecting whether the current particle size difference is greater than the preset particle size difference. In this embodiment, the preset particle size difference is a specified difference between the first particle size parameter and the preset particle size parameter, which can be confirmed based on industry experience. By comparing the current particle size difference with the preset particle size difference, it can reflect the degree to which the particle size of the first powder deviates from the particle size required for membrane production.

[0130] S253, if the current particle size difference is greater than the preset particle size difference, a power increase signal is sent to the sand mill assembly. In this embodiment, the current particle size difference is greater than the preset particle size difference, indicating that the particle size of the first powder deviates too much from the particle size required for membrane production, that is, the grinding intensity of the grinding assembly being used on the raw material is low. By sending a power increase signal to the sand mill assembly, the operating power of the sand mill assembly is increased, the grinding effect of the grinding assembly on the dopant is improved, and the number of grinding times and time are reduced.

[0131] In one embodiment, S252, detecting whether the current particle size difference is greater than a preset particle size difference, and then further comprising:

[0132] S252a, if the current particle size difference is less than or equal to the preset particle size difference, drive the sand mill assembly to maintain the current power operation. In this embodiment, the current particle size difference is less than or equal to the preset particle size difference, indicating that the particle size of the first powder deviates from the particle size required for the diaphragm production by a small amount, that is, the first powder can quickly reach the particle size required for the diaphragm production after further grinding by the grinding assembly, so that the sand mill assembly can be driven to maintain the current power operation, reducing the consumption of additional power.

[0133] In one of the embodiments, the preset particle size parameter is between 5μm and 15μm. In this embodiment, the size of the preset particle size parameter is determined based on the texture of the raw material, the type of lithium battery diaphragm and industry experience. The larger the preset particle size parameter, the smaller the particle size of the powder required for the lithium battery diaphragm being produced, indicating that the requirements for the first particle size parameter are more stringent, that is, the particle size of the first powder needs to be smaller to meet the particle size requirements for diaphragm production, which will cause the raw material to be ground for a longer time. By setting the preset particle size parameter between 5μm and 15μm, it is possible to reduce grinding hours and improve production efficiency while meeting the production requirements of lithium battery diaphragms.

[0134] like Figure 3 As shown, the present disclosure also provides a powder production device 10 that adopts a method for producing lithium battery ceramic diaphragm powder based on dispersion doping to improve particle size as in any of the above embodiments, including a dispersion storage tank 100, a sand mill component 200, a powder inspection tank 300 and a powder buffer tank 400; the sand mill component 200 is connected to the dispersion storage tank 100, and the sand mill component 200 is used to grind the first raw material or the doping material; the feed end of the powder inspection tank 300 is connected to the discharge end of the sand mill component 200; the powder inspection tank 300 is used to store the first powder for inspection; the powder inspection tank 300 is respectively provided with a discharge port and a return port, and the discharge port is used to guide out the first powder; the feed end of the powder buffer tank 400 is connected to the return port, and the powder buffer tank 400 is used to buffer the second powder; the discharge end of the powder buffer tank 400 is connected to the dispersion storage tank 100, and the second raw material and the second powder are dispersed and doped in the dispersion storage tank 100.

[0135] It can be understood that by applying the lithium battery ceramic diaphragm powder production method based on dispersed doping to improve particle size disclosed in the present invention to the powder production equipment 10, the first raw material is conveyed to the sand mill assembly 200, and the first raw material is ground by the sand mill assembly 200 to obtain the first powder. Because the discharge end of the sand mill assembly 200 is connected to the feed end of the powder inspection tank 300, the first powder can enter the powder inspection tank 300, and the first particle size parameter can be obtained by detecting the first powder in the powder inspection tank 300. If the first particle size parameter is greater than the preset particle size parameter, it indicates that the first powder in the powder inspection tank 300 is The powder does not meet the production requirements. At this time, since the return port of the powder inspection tank 300 is connected to the feed end of the powder buffer tank 400, the first powder can enter the powder buffer tank 400 to form the second powder, and the powder buffer tank 400 is connected to the dispersion tank 100, so that the second powder can be dispersed and mixed with the second raw material in the dispersion tank 100. Since the dispersion tank 100 is connected to the sand mill assembly 200, the doping material in the dispersion tank 100 can be transported to the sand mill assembly 200, and then the second powder can enter the sand mill assembly 200 for grinding together with the second raw material. In this way, the raw materials of the previous process can be ground in time, and the ground materials can enter the equipment of the next process, thereby reducing the impact of repeated powder grinding on the beat and efficiency of the production line. At the same time, according to this method, raw materials of different batches and textures can be ground through the same sand mill assembly 200, so there is no need to replace or install new grinding equipment, reducing the investment in production costs.

[0136] In one embodiment, the sand mill assembly 200 includes at least two sand mills 210 connected to each other, and the dispersion tank 100 is connected to each sand mill 210; the powder inspection tank 300 is connected to the dispersion tank 100 and each sand mill 210. It can be understood that since the dispersion tank 100 is connected to each sand mill 210, the raw materials in the dispersion tank 100 can be ground by any grinding machine, and the production will not be interrupted due to the failure or maintenance of a sand mill 210. At the same time, since the sand mills 210 are connected to each other, the sand mills 210 are connected in series, and the powder inspection tank 300 is connected to each sand mill 210, so that the operator can flexibly adjust the route according to the texture of the raw materials, so that the raw materials can pass through a single or several sand mills 210 in sequence. Because the powder inspection tank 300 is also connected to the dispersion tank 100, when all sand mills 210 fail or are under maintenance, the impact on production is reduced.

[0137] In one embodiment, the sand mill assembly includes a first sand mill and a second sand grinder that are connected to each other, the dispersion tank is connected to the first sand grinder and the second sand grinder respectively, and the powder inspection tank is connected to the dispersion tank, the first sand grinder and the second sand grinder respectively. It can be understood that since the dispersion tank is connected to the first sand grinder and the second sand grinder respectively, the raw materials in the dispersion tank can be selectively supplied to the first sand grinder and the second sand grinder, and any failure or maintenance of the first sand grinder and the second sand grinder will not cause production interruption. At the same time, since the powder inspection tank is connected to the dispersion tank, the first sand grinder and the second sand grinder respectively, the raw materials can be ground in sequence through a single or two sand mills. Alternatively, the raw materials in the dispersion tank can directly enter the powder inspection tank to reduce the impact of sand mill failure or maintenance on production.

[0138] Compared with the prior art, the present invention has at least the following advantages:

[0139] The above-mentioned method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size, by conveying the first raw material to the sand mill component, so that the sand mill component can grind the first raw material into a first powder, after detecting the first powder, the particle size of the first powder can be collected to obtain a first particle size parameter, and the first particle size parameter can reflect the particle size of the first powder, that is, it can indicate the grinding effect of the sand mill component, and then by judging whether the first particle size parameter is greater than the preset particle size parameter, it can be reflected whether the particle size of the first powder meets the standard, if the first particle size parameter is greater than the preset particle size parameter, it can be determined that the particle size of the first powder deviates from the standard, at this time, the first powder is conveyed to the powder buffer tank to form a second powder, and the second raw material and the second powder are dispersedly doped according to the dynamic doping ratio, so that the second powder can enter the sand mill component together with the second raw material for grinding, so that the raw material of the previous process can be ground in time, and the material after the raw material is ground can enter the equipment of the next process, thereby reducing the impact of repeated grinding of powder on the beat and efficiency of the production line. At the same time, according to this method, raw materials of different batches and textures can be ground by the same sand mill component, so there is no need to replace or install new grinding equipment, thus reducing the investment in production costs.

[0140] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. A method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size, characterized in that: include: Conveying a first raw material to a sand mill assembly to obtain a first powder; Performing a replica grinding test operation on the first powder; The replica grinding detection operation includes: detecting the first powder to obtain a first particle size parameter; Determining whether the first particle size parameter is greater than a preset particle size parameter; If the first particle size parameter is greater than the preset particle size parameter, the first powder is transported to a powder buffer tank to form a second powder; Dispersing and doping the second raw material and the second powder according to a dynamic doping ratio to obtain a doping material; conveying the doping material to the sanding assembly to grind the doping material; Wherein, the dynamic doping ratio is obtained according to the following steps: Obtaining a feeding rate of the second raw material; Obtaining a discharge rate of the second powder; Performing powder speed ratio processing on the feeding rate and the discharging rate to obtain a doping flow rate ratio; Detecting whether the doping flow rate ratio is less than or equal to a preset doping flow rate ratio; When the doping flow rate ratio is less than or equal to the preset doping flow rate ratio, the feeding rate of the second raw material is increased and the discharging rate of the second powder is reduced.

2. The method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size according to claim 1, characterized in that: The method further comprises: conveying the doping material to the sand mill assembly to grind the doping material; and then: driving the sand mill assembly to grind the doping material to obtain a third powder; The third powder is used as a new first powder and returned to the replica grinding and testing operation step.

3. The method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size according to claim 1, characterized in that: The step of determining whether the first particle size parameter is greater than a preset particle size parameter further includes: If the first particle size parameter is less than or equal to the preset particle size parameter, the first powder is exported.

4. The method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size according to claim 1, characterized in that: The first powder is transported into a powder buffer tank to form a second powder, and then further comprises: According to the cumulative opening time of the one-way valve, the duration of powder passage is obtained; Detecting whether the powder passage duration is greater than or equal to a preset passage duration; If the powder passage duration is greater than or equal to the preset passage duration, the feed rate and the discharge rate are increased simultaneously.

5. The method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size according to claim 4, characterized in that: The step of detecting whether the powder passage duration is greater than or equal to the preset passage duration further includes: If the powder passage duration is less than the preset passage duration, obtaining the cumulative opening statistics times according to the cumulative times the one-way valve is opened; Detecting whether the cumulative number of start statistics is greater than or equal to a preset cumulative number; If the cumulative number of opening statistics is greater than or equal to the preset cumulative number, the working power of the feed diaphragm pump is balanced.

6. The method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size according to claim 1, characterized in that: The method of dispersing and doping the second raw material and the second powder according to the dynamic doping ratio to obtain the doped material includes: delivering a first preset amount of the second raw material to a dispersed storage tank; The second preset amount of the second powder is delivered to the dispersion tank in multiple times to disperse and dope the second raw material and the second powder to obtain the doped material; wherein the first preset amount is greater than the second preset amount.

7. The method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size according to claim 1, characterized in that: The method of conveying the doping material to the sand mill assembly to grind the doping material also includes: Calculating the difference between the first particle size parameter and the preset particle size parameter to obtain a current particle size difference; Detecting whether the current particle size difference is greater than a preset particle size difference; If the current particle size difference is greater than the preset particle size difference, a power increase signal is sent to the sanding assembly.

8. The method for preparing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size according to claim 7, characterized in that: The step of detecting whether the current particle size difference is greater than the preset particle size difference further includes: If the current particle size difference is less than or equal to the preset particle size difference, the sanding assembly is driven to maintain the current power operation.

9. A powder production device using the method for producing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size as described in any one of claims 1 to 8, characterized in that: include: decentralized storage tanks; A sand mill component, the sand mill component is connected to the dispersion storage tank, and the sand mill component is used to grind the first raw material or the doping material; A powder inspection tank, wherein the feeding end of the powder inspection tank is connected to the discharging end of the sand mill assembly; the powder inspection tank is used to store the first powder for testing; the powder inspection tank is respectively provided with a discharging port and a return port, and the discharging port is used to guide out the first powder; A powder buffer tank, wherein the feeding end of the powder buffer tank is connected to the return port, and the powder buffer tank is used to buffer the second powder; the discharging end of the powder buffer tank is connected to the dispersion storage tank, and the second raw material and the second powder are dispersed and doped in the dispersion storage tank.

10. The powder production equipment of the method for producing lithium battery ceramic diaphragm powder based on dispersed doping to improve particle size according to claim 9, characterized in that: The sand mill assembly includes at least two sand mills connected to each other, and the dispersion storage tank is connected to each of the sand mills respectively; the powder inspection tank is connected to the dispersion storage tank and each of the sand mills respectively.

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