Grinding device for grinding battery material

Abstract

The invention discloses a grinding device for grinding a battery material, and relates to the technical field of grinding. The grinding device comprises a first containing part, a second containing part, a grinding machine, a detection device and a controller, the first containing part and the second containing part are used for containing suspension liquid of the battery material, the grinding machine comprises a grinding cavity and a grinding part, and the grinding part is rotatably arranged in the grinding cavity to grind the suspension liquid; the first containing piece and the second containing piece are communicated with the grinding cavity, the detection device is used for detecting the granularity of suspension liquid in the first containing piece or the second containing piece, the controller is electrically connected with the detection device and the grinding machine, and the controller is configured to control the rotating speed and / or the grinding time of the grinding piece according to the obtained granularity result. According to the grinding device for grinding the battery material, automatic regulation and control of grinding can be achieved, and the productivity of the grinding material is improved.

Description

Technical Field

[0001] The present invention relates to the field of grinding technology, and in particular to a grinding device for grinding battery materials. Background Art

[0002] In the related art, under the condition of a certain grinding flow rate, manual sampling is required for particle size detection after each grinding, and grinding or discharging is continued after the particle size detection result comes out, which has a high time cost and low production capacity per unit time. At the same time, according to the particle size after the test, the controllability of the particle size by manually adjusting the fine grinding machine parameters is poor. As the machine damage occurs, the adjustment of manual experience values ​​will magnify this defect and further reduce the production capacity per unit time. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an object of the present invention is to provide a grinding device for grinding battery materials, which can realize automatic control of grinding and improve the production capacity of grinding materials.

[0005] According to an embodiment of the present invention, a grinding device for grinding battery materials comprises a first holding member, a second holding member, a grinder, a detection device and a controller. The first holding member and the second holding member are used to hold a suspension of the battery material. The grinder comprises a grinding chamber and a grinding member. The grinding member is rotatably disposed in the grinding chamber to grind the suspension. The first holding member and the second holding member are respectively connected to the grinding chamber. The detection device is used to detect the particle size of the suspension in the first holding member or the second holding member. The controller is electrically connected to the detection device and the grinder, respectively. The controller is configured to control the rotation speed and / or grinding time of the grinding member according to the obtained particle size result.

[0006] The grinding device for grinding battery materials according to the embodiment of the present invention can realize automatic control of grinding and improve the production capacity of grinding materials.

[0007] In addition, the grinding device for grinding battery materials according to the above embodiment of the present invention may also have the following additional technical features:

[0008] In some examples, the grinding device further includes an electrically controlled sampler, and the sampler is used to transport the suspension in the first container or the second container to the detection device.

[0009] In some examples, the sampler is a robotic arm.

[0010] In some examples, the grinding device further includes a first sensor for detecting an operating state of the grinding member, and the sampler is configured to extract the suspension when the first sensor detects that the grinding member stops rotating.

[0011] In some examples, the grinding device further includes a connecting pipe, through which the first containing member and the detection device, as well as the second containing member and the detection device are connected, and each of the connecting pipes is provided with a control valve for controlling its on-off function.

[0012] In some examples, the grinding device further includes a first sensor for detecting an operating state of the grinding member, and the control valve is configured to open when the first sensor detects that the grinding member stops rotating to allow the suspension to flow toward the detection device.

[0013] In some examples, the controller is configured to pre-store a first particle size interval and a second particle size interval, the minimum particle size within the first particle size interval is greater than the maximum particle size within the second particle size interval, and the controller is configured to adjust the grinding time of the grinding member when it is determined that the detected particle size is within the first particle size interval, and adjust the rotation speed of the grinding member when it is determined that the detected particle size is within the second particle size interval.

[0014] In some examples, the controller is configured to adjust the rotation speed and / or grinding time of the grinding member according to the detected particle size result and actual particle size requirement.

[0015] In some examples, the grinding device further includes a second sensor for detecting a liquid level in the grinding chamber, and the controller and / or the grinder is configured to control an operating state of the grinding member according to a detection result of the second sensor.

[0016] In some examples, at least one of the controller and the grinder is provided with an input interface for inputting information, and the grinder is configured to control the operating state of the grinding member according to the input information.

[0017] Another object of the present invention is to provide a method for grinding a lithium iron phosphate positive electrode material, wherein the grinding method uses the above-mentioned grinding device, and the grinding method comprises:

[0018] When the particle size D50 of the suspension is detected to satisfy 0.6 μm<D50≤1.2 μm, the grinding time of the grinding element is increased;

[0019] The particle size D50 of the suspension is detected to satisfy 0.4 μm<D50≤0.6 μm, and the rotation speed of the grinding element is increased.

[0020] In some examples, the particle size D50 of the suspension is detected to satisfy 0.8 μm≤D50≤1.2 μm, and the grinding time of the grinding member is controlled to increase by a first time length;

[0021] The particle size D50 of the suspension is detected to satisfy 0.6 μm<D50<0.8 μm, and the grinding time of the grinding member is controlled to increase a second time period, and the second time period is greater than the first time period.

[0022] In some examples, the second duration is a multiple of the first duration.

[0023] In some examples, the particle size D50 of the suspension is detected to satisfy 0.5 μm≤D50≤0.6 μm, and the rotation speed of the grinding element is controlled to increase to a first rotation speed;

[0024] The particle size D50 of the suspension is detected to satisfy 0.4 μm<D50<0.5 μm, and the grinding time of the grinding member is controlled to increase a second rotation speed, wherein the second rotation speed is greater than the first rotation speed.

[0025] In some examples, the second rotational speed is a multiple of the first rotational speed.

[0026] In some examples, the particle size D50 of the suspension is detected to satisfy D50>1.2 μm or D50<0.3 μm, and a warning message is issued. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of a grinding device in some embodiments of the present invention.

[0028] Figure 2 1 is a flowchart of the grinding device in some embodiments of the present invention.

[0029] Figure 3 is a first flow chart of the grinding method in some embodiments of the present invention.

[0030] Figure 4 is a second flow chart of the grinding method in some embodiments of the present invention.

[0031] Reference numerals:

[0032] Grinding device 100 , first containing member 10 , second containing member 20 , grinder 30 , grinding chamber 31 , grinding member 32 , detection device 40 , controller 50 , first sampler 60 , second sampler 70 . DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] The present invention proposes a grinding device 100 for grinding battery materials, which can realize automatic control of grinding and improve the production capacity of grinding materials.

[0035] like Figure 1 According to an embodiment of the present invention, a grinding device 100 for grinding battery materials includes a first containing member 10 , a second containing member 20 , a grinder 30 , a detection device 40 and a controller 50 .

[0036] Among them, the first container 10 and the second container 20 are used to hold the suspension of battery materials, the grinder 30 includes a grinding chamber 31 and a grinding piece 32, the grinding piece 32 is rotatably arranged in the grinding chamber 31 to grind the suspension, and the first container 10 and the second container 20 are respectively connected to the grinding chamber 31; the detection device 40 is used to detect the particle size of the suspension in the first container 10 or the second container 20, the controller 50 is electrically connected to the detection device 40 and the grinder 30, and the controller 50 is configured to control the rotation speed and / or grinding time of the grinding piece 32 according to the obtained particle size results; in this way, automatic control of grinding can be achieved and the production capacity of the grinding material can be improved.

[0037] For example, during the initial grinding, the first holding member 10 can hold the suspension to be ground, the suspension in the first holding member 10 can be discharged to the grinding chamber 31 of the grinder 30, and the grinding member 32 in the grinding chamber 31 grinds the suspension according to the initial working parameters, and the ground suspension can be discharged from the grinding chamber 31 to the second holding member 20, at which time the detection device 40 can detect the particle size of the suspension in the second holding member 20, and the detection device 40 sends the detection result to the controller 50, and the controller 50 can adjust the rotation speed of the grinding member 32 according to the particle size of the suspension detected. speed and / or grinding time; in this way, after the secondary grinding, the suspension in the second holding member 20 can be discharged to the grinding chamber 31 of the grinder 30, and the grinding member 32 in the grinding chamber 31 grinds the suspension again, and the ground suspension can be discharged to the first holding member 10, at which time the detection device 40 can detect the particle size of the suspension in the first holding member 10, and when the particle size of the suspension reaches the target value, the controller 50 can control the suspension in the first holding member 10 to be discharged; if the particle size of the suspension does not reach the target value, it can be ground multiple times until the particle size of the suspension reaches the target value.

[0038] In the related art, after the grinding machine 30 is finished, the operator needs to sample the suspension in the first container 10 or the second container 20, and send the sample to a predetermined detection center for detection, and then adjust the rotation speed or grinding time of the grinder 30 according to the detection result, which is inefficient and leads to low production capacity. Therefore, according to the grinding device 100 for grinding battery materials according to the embodiment of the present invention, automatic control of grinding can be achieved, thereby improving the production capacity of the grinding material.

[0039] In addition, in some specific examples, the first holding member 10 can be set as a first grinding jar, and the second holding member 20 can be set as a second grinding jar. Before the detection device 40 detects the particle size of the suspension in the first holding member 10 or the second holding member 20, the suspension therein is stirred for a predetermined time by the first grinding jar, and the suspension therein is stirred for a predetermined time by the second grinding jar. The predetermined time can be set within the range of 5min-10min, so that the suspension is stirred evenly, thereby improving the detection accuracy of the detection device 40 on the suspension.

[0040] In addition, in combination with the above, before the initial grinding, the first container 10 can stir the suspension therein for a predetermined period of time, and the detection device 40 can detect the particle size of the suspension in the first container 10. When the particle size of the suspension meets the working requirements of the grinder 30, the controller 50 will discharge the suspension in the first container 10 to the detection device 40; for example, when the grinder 30 is a fine grinder, the suspension can first undergo a coarse grinding step and then enter the first container 10 of the grinding device 100. At this time, the detection device 40 can detect the particle size of the suspension in the first container 10 to prevent the particle size from being too large and exceeding the working capacity of the grinder 30, thereby causing damage to the grinder 30.

[0041] In some specific examples, the grinder 30 includes a first material port, a second material port, a cooling water inlet, a cooling water outlet, a grinding body, a grinding piece 32, a mechanical seal and a mechanical shaft, wherein the first material port is connected to the first holding piece 10, the second material port is connected to the second holding piece 20, the grinding body is provided with a cold water circulation channel, the cooling water inlet and the cooling water outlet are connected to the cooling water circulation channel, for cooling the grinder 30; the grinding body is provided with a grinding chamber 31, the grinding piece 32 is rotatably disposed in the grinding chamber 31, the mechanical shaft is transmission-connected to the grinding piece 32, and is passed through the mounting port of the grinding body, and the mechanical seal is disposed at the mounting port for sealing the interior of the grinding body.

[0042] like Figure 1 In some embodiments of the present invention, the grinding device 100 also includes an electrically controlled sampler, which is used to transport the suspension in the first container 10 or the second container 20 to the detection device 40; in this way, the production efficiency of the grinding device 100 can be further improved to increase the production capacity of the grinding material.

[0043] It is understandable that when sampling, after the controller 50 receives the stop signal of the grinder 30, it can control the sampler to take samples from the first container 10 or the second container 20 to ensure the safety of the sampling process, as well as the representativeness and accuracy of the samples. After the sampling is completed, the suspension can be transported to the detection device 40. The particle size of the suspension can be detected by the detection device 40, which can improve the production efficiency of the grinding device 100, thereby improving the production capacity of the grinding material.

[0044] In addition, in some specific examples, the sampler includes a first sampler 60 and a second sampler 70. The first sampler 60 is used to transport the suspension in the first container 10 to the detection device 40, and the second sampler 70 is used to transport the suspension in the second container 20 to the detection device 40. In this way, the first container 10 or the second container 20 can be sampled separately, thereby improving operational flexibility and efficiency.

[0045] In some embodiments of the present invention, the sampler is a robotic arm, and the robotic arm transmits signals to the controller 50. The robotic arm can be loaded with an instrument for holding the suspension. The controller 50 can send a sampling signal to the robotic arm. The robotic arm can sample the suspension in the first holding member 10 or the second holding member 20, and transport the sample to the detection device 40. The detection device 40 detects whether the particle size of the suspension meets the target value, thereby improving production efficiency.

[0046] In some embodiments of the present invention, the grinding device 100 also includes a first sensor for detecting the operating status of the grinding member 32, and the sampler is configured to extract the suspension when the first sensor detects that the grinding member 32 stops rotating; in this way, the safety of the sampling process can be ensured, as well as the representativeness and accuracy of the sample.

[0047] Optionally, the first sensor may be a paddle stop sensor, which can detect the operating status of the grinding member 32. When the grinding member 32 stops running, the paddle stop sensor can detect that the grinding member 32 stops running, and transmit the signal that the grinding member 32 stops running to the controller 50. At this time, the controller 50 can control the sampler to sample the suspension in the first container 10 or the second container 20 to ensure the safety of the sampling process, avoid damage caused by structural interference between equipment, and ensure the representativeness and accuracy of the sample, so as to facilitate the regulation of the grinder 30 according to the detected particle size of the sample.

[0048] In some embodiments of the present invention, the grinding device 100 also includes a connecting pipe, and the first containing component 10 and the detection device 40 as well as the second containing component 20 and the detection device 40 are connected by the connecting pipe, and each connecting pipe is provided with a control valve for controlling its on and off; in this way, the suspension in the first containing component 10 or the second containing component 20 can be discharged to the detection device 40 through the connecting pipe, thereby improving the production efficiency of the grinding device 100.

[0049] Specifically, the connecting pipe includes a first connecting pipe and a second connecting pipe, and the control valve includes a first control valve and a second control valve; one end of the first connecting pipe is connected to the first containing member 10, the other end of the first connecting pipe is connected to the detection device 40, and the first connecting pipe is provided with a first control valve; one end of the second connecting pipe is connected to the second containing member 20, the other end of the second connecting pipe is connected to the detection device 40, and the second connecting pipe is provided with a second control valve; taking the first connecting pipe as an example, when detection is required, the controller 50 receives a stop signal of the grinder 30 sent by the first sensor, and can control the first control valve to open the first connecting pipe, under the action of gravity, the suspension in the first containing member 10 can flow to the detection device 40, and when the suspension flowing to the detection device 40 reaches a predetermined amount, the first control valve is controlled to close the first connecting pipe, and the particle size of the suspension is detected by the detection device 40 to improve production efficiency. Similarly, the second containing member 20 can discharge the suspension therein to the detection device 40 through the second connecting pipe and the second control valve to improve production efficiency.

[0050] Furthermore, since the smaller the particle size of the suspension is, the higher its viscosity is, the suspension cannot be discharged to the detection device 40 well under the action of gravity. Therefore, a first pump body and a second pump body can be provided. The first pump body can drive the suspension in the first containing member 10 to be discharged to the detection device 40, and the second pump body can drive the suspension in the second containing member 20 to be discharged to the detection device 40, so as to further improve production efficiency.

[0051] In some embodiments of the present invention, the grinding device 100 also includes a first sensor for detecting the operating status of the grinding member 32, and the control valve is configured to open when the first sensor detects that the grinding member 32 stops rotating so that the suspension flows to the detection device 40; in this way, the safety of the sampling process can be ensured, as well as the representativeness and accuracy of the sample.

[0052] Optionally, the first sensor may be a paddle stop sensor, which can detect the operating status of the grinding member 32. When the grinding member 32 stops running, the paddle stop sensor can detect that the grinding member 32 stops running, and transmit the signal that the grinding member 32 stops running to the controller 50. At this time, the controller 50 can control the control valve to open, so that the suspension in the first holding member 10 or the second holding member 20 can flow to the detection device 40, so as to ensure the safety of the sampling process, avoid damage caused by structural interference between equipment, and ensure the representativeness and accuracy of the sample, so as to facilitate the regulation of the grinder 30 according to the detection particle size of the sample.

[0053] like Figure 1 In some embodiments of the present invention, the controller 50 is configured to pre-store a first particle size interval and a second particle size interval, the minimum particle size in the first particle size interval is greater than the maximum particle size in the second particle size interval, and the controller 50 is configured to adjust the grinding time of the grinding member 32 when it is determined that the detected particle size is within the first particle size interval, and adjust the rotation speed of the grinding member 32 when it is determined that the detected particle size is within the second particle size interval; in this way, the number of switching times can be reduced and the production efficiency of the grinding device 100 can be improved.

[0054] Specifically, when the particle size of the suspension is relatively large and is in a first particle size range, the suspension may be rough ground first. At this time, the grinding time of the suspension may be increased while the rotation speed of the grinding member 32 remains unchanged to reduce the particle size of the suspension. When the particle size of the suspension is in a second particle size range, the suspension may be fine ground. At this time, the rotation speed of the grinding member 32 may be increased while the grinding time of the grinding member 32 remains unchanged to reduce the particle size of the suspension to a target value, so as to obtain a grinding material that meets the requirements.

[0055] More specifically, the first particle size interval includes a first particle size range and a second particle size range, the second particle size interval includes a third particle size range and a fourth particle size range, the maximum value of the second particle size range is less than the minimum value of the first particle size range, the maximum value of the third particle size range is less than the minimum value of the second particle size range, and the maximum value of the fourth particle size range is less than the minimum value of the third particle size range; the controller 50 is configured to increase the first grinding time based on the last grinding time of the grinding member 32 when the detected particle size is within the first particle size range; and increase the first grinding time based on the last grinding time of the grinding member 32 when the detected particle size is within the second particle size range. The second grinding time is increased on the basis of the last grinding time; when the detected particle size is within the third particle size range, the first grinding speed is increased on the basis of the last grinding speed of the grinding member 32; when the detected particle size is within the fourth particle size range, the second grinding speed is increased on the basis of the last grinding speed of the grinding member 32; in this way, the controller 50 can adjust the grinding speed and grinding time of the grinding member 32 according to the particle size detection information fed back by the detection device 40; compared with manual adjustment, the number of switching times of the suspension in the grinding device 100 can be reduced, thereby improving the production efficiency of the grinding device 100.

[0056] In addition, refer to the following table, which shows the specific control method of the suspension particle size:

[0057] Table 1 shows the control scheme of the particle size control system

[0058]

[0059] In some specific examples, the target value of the suspension particle size D50 is 0.35±0.05μm, the first particle size range is set to 0.8μm≤D50≤1.2μm; the second particle size range is set to 0.6μm<D50<0.8μm; the third particle size range is set to 0.5μm≤D50≤0.6μm; the fourth particle size range is set to 0.4μm<D50<0.5μm; when the detection device 40 detects that the particle size D50 of the suspension is in the first particle size range, the grinding member 32 is controlled to be based on the last grinding time. When the detection device 40 detects that the particle size D50 of the suspension is in the second particle size range, the grinding member 32 is controlled to increase the grinding time by 10 minutes based on the last grinding time; when the detection device 40 detects that the particle size D50 of the suspension is in the third particle size range, the grinding member 32 is controlled to increase the grinding speed by 50 rpm based on the last grinding speed; when the detection device 40 detects that the particle size D50 of the suspension is in the fourth particle size range, the grinding member 32 is controlled to increase the grinding speed by 100 rpm based on the last grinding speed. In addition, before the initial grinding, the detection device 40 can detect the particle size of the suspension. If the particle size D50 of the suspension is greater than 1.2 μm, the particle size of the suspension does not meet the initial grinding requirements of the grinding device 100, and it exceeds the working capacity of the grinding device 100, and the suspension can be discharged; after grinding, the detection device 40 can detect the particle size of the suspension. If the particle size D50 of the suspension is less than 0.3 μm, the particle size of the suspension does not meet the requirements, and its particle size is too small, and the suspension can be discharged.

[0060] In some embodiments of the present invention, the controller 50 is configured to adjust the rotation speed and / or grinding time of the grinding element 32 according to the detected particle size results and the actual particle size requirements; in this way, the particle size control efficiency of the suspension can be improved, the number of suspension switching times can be reduced, and the production efficiency of the grinder 30 can be improved.

[0061] It can be understood that, based on the aforementioned controller 50, according to the particle size detection result of the suspension, the grinding speed and grinding time of the grinding member 32 are controlled and adjusted, and in each adjustment, the controller 50 can record the change value of the suspension particle size, the corresponding grinding member 32 speed adjustment value and the corresponding grinding member 32 time adjustment value, and input these data into the preset multiple regression prediction model in the controller 50. Through the multiple regression prediction model, the relationship between the change value of the suspension particle size and the adjustment value of the grinding speed and the adjustment value of the grinding time is obtained. In this way, the multiple regression prediction model can be used to further guide the particle size control of the suspension in the grinder 30 to reduce the number of switching times of the suspension in the grinding device 100 and improve production efficiency. Referring to Table 2 below, for example, during manual adjustment, it is necessary to adjust the grinding time or grinding speed separately according to the particle size of the suspension after grinding, and the adjustment efficiency is low. When the initial suspension particle size is 1.0 μm, it is necessary to adjust multiple times to reach the target particle size of 0.35 μm, that is, the grinding process of the suspension is 1.0 μm→0.8 μm→0.55 μm→0.38 μm. However, through the multiple regression prediction model, the time can be adjusted separately, the speed can be adjusted separately, or the time and speed can be adjusted synchronously, so that the grinding process of the suspension is 1.0 μm→0.68 μm→0.35 μm, so as to reduce the number of switching times of the suspension in the grinding device 100 and improve production efficiency and capacity; and manual adjustment is prone to over-regulation, that is, the particle size of the suspension after multiple grindings will be lower than 0.3 μm, which does not meet the demand; while the multiple regression prediction model can achieve more precise regulation and reduce the generation of waste liquid.

[0062] It can also be understood that the multivariate regression prediction model is △D50=a△t+b△n+k, △D50 represents the change value of the suspension particle size, △t represents the adjustment value of the grinding time, △n represents the adjustment value of the grinding speed, and through the input of a large amount of historical adjustment data, the coefficients a, b, and k can be obtained to obtain the relationship between the change value of the suspension particle size and the adjustment value of the grinding speed and the adjustment value of the grinding time, so as to guide the control of the grinder 30 with the help of the multivariate regression prediction model; and as the number of controls increases, the controller 50 can further use the increased control data correction coefficient to achieve more precise control.

[0063] In some embodiments of the present invention, the grinding device 100 also includes a second sensor for detecting the liquid level in the grinding chamber 31, and the controller 50 and / or the grinder 30 are configured to control the operating state of the grinding member 32 according to the detection result of the second sensor; in this way, the liquid level in the grinding chamber 31 can be detected by the second sensor to ensure the stability of the grinding chamber 31, avoid overloading or insufficient material in the grinding chamber 31, and thus improve the stability of the grinder 30.

[0064] Optionally, the second sensor may be a material level sensor, which can detect the liquid level in the grinding chamber 31; during initial grinding, the suspension in the first containing member 10 is detected by the detection device 40, and when it is determined that the particle size of the suspension is suitable for grinding by the grinder 30, it can be discharged into the grinding chamber 31 of the grinder 30. When the material level sensor detects that the liquid level in the grinding chamber 31 reaches a predetermined range, the signal is transmitted to the controller 50. The controller 50 controls the rotation of the grinding member 32 according to the detection structure of the second sensor to ensure that the liquid level in the grinding chamber 31 is within the predetermined range, so as to avoid overloading of the grinding chamber 31 or insufficient material, which may cause damage to the grinder 30 and improve production safety.

[0065] In some embodiments of the present invention, at least one of the controller 50 and the grinder 30 is provided with an input interface for inputting information, and the grinder 30 is configured to control the operating state of the grinding member 32 according to the input information; in this way, it is convenient for the operator to set parameters through the input interface so as to regulate the operation of the grinder 30 through the input interface.

[0066] Specifically, for different grinding, the operator needs to input different initial working parameters through the input interface. For example, before the initial grinding, the operator needs to input, for example, the amount of suspension added: 5±0.2L; grinding time: 20min; grinding speed: 300rpm. The grinder 30 uses this as the initial operating condition to grind the suspension therein. Subsequently, the operator can input adjustment parameters to the input interface of the controller 50 and / or the grinder 30 according to the detection results of the particle size of the suspension after grinding and the particle size range corresponding to the particle size of the suspension. The controller 50 receives the input adjustment parameters and can control the grinder 30 to operate according to the input adjustment parameter information to realize the regulation of the grinder 30. Of course, the grinding device 100 can also be regulated by the multivariate regression model preset in the controller 50 to meet the grinding requirements.

[0067] In addition, the first container 10 and the second container 20 also transmit signals with the controller 50. The first container 10 includes a first body and a first stirring member. The first stirring member is rotatably disposed in the first body. The first container 10 is configured to control the operating state of the first stirring member according to the input information. The operator can input different working parameters in the input interface. For example, before detecting the particle size of the suspension in the first container 10, the operator can input, for example, stirring time: 5min-10min. The first stirring member uses this as the operating condition. Whenever the grinder 30 stops, the first container 10 can stir the discharged suspension for 5min-10min to make the suspension uniformly stirred for the convenience of detection by the detection device 40. Similarly, the second container 20 includes a second body and a second stirring member. The second stirring member is rotatably disposed in the second body. The second container 20 is configured to control the operating state of the second stirring member according to the input information. Whenever the grinder 30 stops, the second container 20 can stir the discharged suspension for a predetermined time to make the suspension uniformly stirred for the convenience of detection by the detection device 40.

[0068] Refer to the following table, taking the grinding liquid (i.e. suspension) with a solute mass of 10kg and a solvent volume of 30L as an example:

[0069] Table 2 is a comparison of the number of grinding liquid switching times and particle size distribution before and after the grinding device was improved

[0070]

[0071] From Table 2, it can be seen that the grinding process of the grinding device 100 using manual adjustment in the related art when using a new holding piece is: 1.2μm→0.8μm→0.55μm→0.38μm, and the grinding process when using an old holding piece is: 1.2μm→0.98μm→0.8μm→0.63μm→0.51μm→0.43μm→0.37μm; while the grinding process of the grinding device 100 in the embodiment of the present invention when using a new holding piece is: 1.2μm→0.68μm→0.35μm, and the grinding process when using an old holding piece is: 1.2μm→0.72μm→0.54μm→0.32μm; in the table of the embodiment of the present invention, "new" refers to a brand new fine grinding jar, and "old" refers to a fine grinding jar that has been used for two years. It can be seen that, compared with the related art, the grinding device 100 of the embodiment of the present invention can reduce the number of suspension switching times and improve production efficiency. Combined with the following table, the following table shows the comparison of unit time production capacity before and after the improvement of the grinding device:

[0072] Table 3 Comparison of unit time capacity before and after the improvement of grinding device

[0073]

[0074] Therefore, by combining Table 2 and Table 3, it can be seen that the production capacity of the grinding device 100 of the embodiment of the present invention is improved compared with the production capacity of the related art before the improvement.

[0075] Reference Figure 2 , Figure 2 The embodiment shows the control process of the grinding device 100 in the embodiment of the present invention. The grinding device 100 is specifically used for fine grinding and crushing of positive electrode materials of lithium (manganese) iron phosphate batteries, wherein the particle size monitoring system can be a detection device 40, the particle size control system can be a controller 50, the fine grinder can be a grinder 30, the fine grinding tank A can be a first holding piece 10, and the fine grinding tank B can be a second holding piece 20.

[0076] In some specific examples, the detection device 40 may be A7000 APS fully automatic counting particle size analyzer.

[0077] like Figure 3 and Figure 4 According to the grinding method for grinding battery materials of an embodiment of the present invention, the grinding method adopts the grinding device in the above embodiment, and the battery material is a positive electrode material of a lithium iron phosphate battery; the grinding method can adjust the working parameters of the grinding device according to the particle size of the suspension, which can reduce the number of switching times of the suspension and improve the production efficiency of the grinder.

[0078] Specifically, the grinding method includes:

[0079] The particle size D50 of the test suspension satisfies 0.6μm<D50≤1.2μm, and the grinding time of the grinding piece is increased;

[0080] The particle size D50 of the suspension is tested to meet 0.4 μm<D50≤0.6 μm, and the rotation speed of the grinding piece is increased.

[0081] It can be understood that when the detection device detects that the particle size D50 satisfies 0.6μm<D50≤1.2μm (i.e., the first particle size range mentioned above), it can send the detection result to the controller. At this time, since the particle size of the suspension is large, the suspension can be roughly ground. That is, after receiving the detection result, the controller can control the grinding part to increase the grinding time. In this way, the grinding time of the grinding part is increased after adjustment, and the other working parameters remain unchanged, so as to grind the suspension and reduce the particle size of the suspension.

[0082] As the particle size of the suspension decreases, the detection device can send the detection result to the controller when it detects that the particle size D50 satisfies 0.4μm<D50≤0.6μm (i.e., the second particle size range mentioned above). At this time, since the particle size of the suspension is small, the suspension can be ground and finished. That is, after receiving the detection result, the controller can control the grinding member to increase the grinding speed. In this way, the grinding speed of the grinding member increases after adjustment, and the other working parameters remain unchanged to grind the suspension and reduce the particle size of the suspension until the particle size of the suspension satisfies 0.3μm≤D50≤0.4μm, and then the suspension is discharged from the grinding device.

[0083] Therefore, compared with manual control in related technologies, the grinding method of the embodiment of the present invention can adjust the working parameters of the grinding device according to the particle size of the suspension, effectively reduce the number of switching times of the suspension in the grinding device, and improve the production efficiency of the suspension.

[0084] like Figure 3 In some embodiments of the present invention, the step of detecting that the particle size D50 of the suspension satisfies 0.6 μm<D50≤1.2 μm and increasing the grinding time of the grinding piece comprises:

[0085] The particle size D50 of the suspension is detected to satisfy 0.8 μm ≤ D50 ≤ 1.2 μm, and the grinding time of the grinding member is controlled to increase a first time length;

[0086] The particle size D50 of the suspension is detected to satisfy 0.6 μm<D50<0.8 μm, and the grinding time of the grinding piece is controlled to increase a second time length, and the second time length is greater than the first time length.

[0087] Specifically, for the aforementioned first particle size interval, in order to refine the adjustment of the grinding piece, improve the particle size control accuracy of the suspension, and further reduce the number of suspension switching times, the first particle size interval can be divided into a first particle size range and a second particle size range, the first particle size range is: 0.8μm≤D50≤1.2μm, and the second particle size range is: 0.6μm<D50<0.8μm; during operation, the detection device detects that the particle size D50 satisfies 0.8μm≤D50≤1.2μm, and can send the detection result to the controller. At this time, since the particle size of the suspension is relatively large, the controller can control the grinding piece to increase the first time length based on the last grinding time to grind the suspension while the other working parameters of the grinding piece remain unchanged.

[0088] As the particle size of the suspension decreases, the detection device detects that the particle size D50 satisfies 0.6μm<D50<0.8μm, and can send the detection result to the controller. At this time, since the particle size of the suspension is relatively small, the controller can control the grinding part to increase the second time on the basis of the last grinding time while keeping the other working parameters of the grinding part unchanged, so as to grind the suspension until the particle size of the suspension satisfies 0.3μm≤D50≤0.4μm, and then discharge the suspension from the grinding device.

[0089] In some embodiments of the present invention, the second duration is a multiple of the first duration, so that the operator can more intuitively obtain the relationship between the working parameter adjustment value and the change in the suspension particle size, and the operator can refine the working parameter adjustment value, further reduce the number of switching times, and improve the production efficiency of the grinding device. In particular, the controller is preset with a multiple regression prediction model, and the working parameter adjustment value increases in multiples, which can facilitate the calculation of the multiple regression prediction model, improve the accuracy of the prediction, and thus improve the controller's control accuracy of the grinding piece. In some specific examples, the first duration can be 5 minutes, and the second duration can be 10 minutes.

[0090] like Figure 4 In some embodiments of the present invention, the particle size D50 of the suspension is detected to satisfy 0.4 μm<D50≤0.6 μm, and the step of increasing the rotation speed of the grinding piece includes:

[0091] The particle size D50 of the suspension is detected to satisfy 0.5 μm ≤ D50 ≤ 0.6 μm, and the rotation speed of the grinding element is controlled to increase to a first rotation speed;

[0092] The particle size D50 of the suspension is detected to satisfy 0.4 μm<D50<0.5 μm, and the grinding time of the grinding piece is controlled to increase a second rotation speed, and the second rotation speed is greater than the first rotation speed.

[0093] Specifically, for the aforementioned second particle size range, in order to refine the adjustment of the grinding piece, improve the precision of the particle size control of the suspension, and further reduce the number of suspension switching times, the second particle size range can be divided into a third particle size range and a fourth particle size range. The third particle size range is: 0.5μm≤D50≤0.6μm, and the fourth particle size range is: 0.4μm<D50<0.5μm; during operation, the detection device detects that the particle size D50 satisfies 0.5μm≤D50≤0.6μm, and can send the detection result to the controller. At this time, since the particle size of the suspension is relatively large, the controller can control the grinding piece to increase the first speed on the basis of the last grinding speed to grind the suspension while the other working parameters of the grinding piece remain unchanged.

[0094] As the particle size of the suspension decreases, the detection device detects that the particle size D50 satisfies 0.4μm<D50<0.5μm, and can send the detection result to the controller. At this time, since the particle size of the suspension is relatively small, the controller can control the grinding part to increase the second time on the basis of the last grinding time while keeping the other working parameters of the grinding part unchanged, so as to grind the suspension until the particle size of the suspension satisfies 0.3μm≤D50≤0.4μm, and then discharge the suspension from the grinding device.

[0095] In some embodiments of the present invention, the second speed is a multiple of the first speed, so that the operator can more intuitively obtain the relationship between the working parameter adjustment value and the change in the suspension particle size, and the operator can refine the working parameter adjustment value, further reduce the number of switching times, and improve the production efficiency of the grinding device. In particular, the controller is preset with a multiple regression prediction model, and the working parameter adjustment value is increased in multiples, which can facilitate the calculation of the multiple regression prediction model, improve the accuracy of the prediction, and thus improve the controller's control accuracy of the grinding piece. In some specific examples, the first speed can be 50rpm, and the second speed can be 100rpm.

[0096] In some embodiments of the present invention, the method for grinding a battery material further comprises:

[0097] If the particle size D50 of the detected suspension satisfies D50>1.2μm or D50<0.3μm, a warning message is issued.

[0098] It can be understood that the grinding method of the embodiment of the present invention adopts the grinding device of the aforementioned embodiment to finely grind the suspension of the electrode material, and before the suspension enters the grinding device, the suspension needs to be coarsely ground so that the particle size of the suspension meets the grinding requirements of the grinding device; during operation, the detection device detects that the particle size of the suspension satisfies D50>1.2μm, then the particle size of the suspension is large, which exceeds the grinding performance of the grinding device and is likely to cause damage to the grinding device. Therefore, it is necessary to discharge the suspension in the first container or the second container, and then coarsely grind the suspension with D50>1.2μm.

[0099] In addition, combined with the foregoing, it can be known that the grinding method in the embodiment of the present invention needs to grind out a suspension with a particle size D50 satisfying 0.3μm≤D50≤0.4μm. Therefore, when the detection device detects that the particle size D50 of the suspension satisfies D50<0.3μm, the suspension in the first container or the second container does not need to be discharged into the grinding chamber for grinding, and the suspension can be directly discharged from the grinding device.

[0100] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0101] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0104] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A grinding device for grinding battery materials, characterized in that: include: A first container (10) and a second container (20) for containing a suspension of the battery material; A grinding machine (30), the grinding machine (30) comprising a grinding chamber (31) and a grinding member (32), the grinding member (32) being rotatably disposed in the grinding chamber (31) to grind the suspension, the first containing member (10) and the second containing member (20) being respectively connected to the grinding chamber (31); A detection device (40), the detection device (40) being used to detect the particle size of the suspension in the first containing member (10) or the second containing member (20); A controller (50) is electrically connected to the detection device (40) and the grinder (30) respectively, and the controller (50) is configured to control the rotation speed and / or grinding time of the grinding element (32) according to the obtained particle size result.

2. The grinding device for grinding battery materials according to claim 1, characterized in that: It also includes an electrically controlled sampler, which is used to transport the suspension in the first containing part (10) or the second containing part (20) to the detection device (40).

3. The grinding device for grinding battery materials according to claim 2, characterized in that: The sampler is a mechanical arm.

4. The grinding device for grinding battery materials according to claim 2, characterized in that: The invention also comprises a first sensor for detecting the running state of the grinding element (32), and the sampler is configured to extract the suspension when the first sensor detects that the grinding element (32) stops rotating.

5. The grinding device for grinding battery materials according to claim 1, characterized in that: It also includes connecting pipes, through which the first containing member (10) and the detection device (40) are connected, and the second containing member (20) and the detection device (40) are connected, and each of the connecting pipes is provided with a control valve for controlling its on and off.

6. The grinding device for grinding battery materials according to claim 5, characterized in that: It also includes a first sensor for detecting the operating state of the grinding element (32), and the control valve is configured to open when the first sensor detects that the grinding element (32) stops rotating to allow the suspension to flow to the detection device (40).

7. The grinding device for grinding battery materials according to claim 1, characterized in that: The controller (50) is configured to pre-store a first particle size interval and a second particle size interval, wherein the minimum particle size in the first particle size interval is greater than the maximum particle size in the second particle size interval, and the controller (50) is configured to adjust the grinding time of the grinding member (32) when it is determined that the detected particle size is within the first particle size interval, and to adjust the rotation speed of the grinding member (32) when it is determined that the detected particle size is within the second particle size interval.

8. The grinding device for grinding battery materials according to claim 1, characterized in that: The controller (50) is configured to adjust the rotation speed and / or grinding time of the grinding element (32) according to the detected particle size result and actual particle size requirement.

9. The grinding device for grinding battery materials according to claim 1, characterized in that: It also includes a second sensor for detecting the liquid level in the grinding chamber (31), and the controller (50) and / or the grinding machine (30) are configured to control the operating state of the grinding element (32) according to the detection result of the second sensor.

10. The grinding device for grinding battery materials according to any one of claims 1 to 9, characterized in that: At least one of the controller (50) and the grinding machine (30) is provided with an input interface for inputting information, and the grinding machine (30) is configured to control the operating state of the grinding element (32) according to the input information.

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