Material drying method, controller and vacuum dryer
By acquiring reference change relationships and adjusting the target parameter set in real time, the problem of substandard moisture content of cathode materials in vacuum dryers was solved, achieving precise control and reduced energy consumption in drying.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-30
- Publication Date
- 2026-04-10
AI Technical Summary
In existing technologies, even after the vacuum dryer has reached the set total drying time, the moisture content of the cathode material still has not decreased to the target moisture content, which affects the battery production yield.
By obtaining a reference change relationship, the moisture content of the material is monitored in real time, and the target parameter set, including vibration frequency and temperature, is adjusted when the difference between the real-time moisture content and the reference moisture content exceeds the range, so as to ensure that the moisture content of the material reaches the target moisture content at the end of the total drying time.
This method achieves the target moisture content of the material precisely at the end of the total drying time, reducing drying energy consumption and improving the accuracy and efficiency of the drying process.
Smart Images
Figure CN121829073A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of material drying technology, and in particular to a material drying method, controller and vacuum dryer. Background Technology
[0002] In the field of battery manufacturing, drying the cathode material is a crucial step in ensuring battery quality and improving battery performance. The purpose of drying the cathode material is to remove excess moisture, bringing its moisture content to a predetermined target level. Generally, a vacuum dryer is used to dry the cathode material. Specifically, the jacket of the vacuum dryer provides heat to the drying chamber containing the cathode material, thereby drying the material.
[0003] Most related technologies employ a constant-temperature drying process, which uses a steam jacket to provide a fixed temperature to the drying chamber and maintains that temperature until the set total drying time is reached. However, this drying method may result in the cathode material's moisture content not decreasing to the target level after the total drying time has been reached, which could negatively impact battery production yield. Summary of the Invention
[0004] This application provides a material drying method, controller, and vacuum dryer, which solves the problem in related technologies that the moisture content of the cathode material has not decreased to the target moisture content after the set total drying time has been reached. Therefore, the first objective of this application is to provide a material drying method, characterized by a controller applied to a vacuum dryer; the method includes: Obtain a reference change relationship, which is: the change relationship between the moisture content of the material and the drying time when the moisture content of the material is reduced to the target moisture content through drying within the target time period; During the drying process of the material at each drying stage, if the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the range of the difference, the target parameter set is adjusted. The reference moisture content is determined based on the reference change relationship and the target time. The target parameter set includes at least one of the target vibration frequency and the target temperature. The material is dried using the adjusted target parameter set so that the real-time moisture content of the material at the end of the last drying stage is less than or equal to the reference moisture content.
[0005] In some optional embodiments, the vacuum dryer further includes: a drying chamber for containing the material; and before drying the material using a target parameter set corresponding to the drying stage, the method further includes: Multiple alternative parameter sets corresponding to the drying stage are obtained, wherein the multiple alternative parameter sets are determined based on at least one alternative vibration frequency corresponding to the drying stage and multiple alternative temperatures corresponding to the vacuum degree of the drying chamber, and each of the alternative parameter sets includes: an alternative vibration frequency and an alternative temperature. Obtain the drying cost for each of the candidate parameter sets, wherein the drying cost is proportional to the candidate vibration frequency and candidate temperature in the candidate parameter set; The set of alternative parameters that minimizes drying cost is determined as the target parameter set.
[0006] In some optional embodiments, the material is a positive electrode material, and the drying cost... cost satisfy: ; in, f The alternative vibration frequency, T The alternative temperature is referred to here.
[0007] In some optional embodiments, for each of the drying stages, if the drying stage is the initial drying stage, then the number of at least one alternative vibration frequency corresponding to the drying stage is one, and the alternative frequency is a preset frequency. If the drying stage is the middle of the drying process, then the number of at least one alternative vibration frequencies corresponding to the drying stage is multiple, and the multiple alternative vibration frequencies are located within a first frequency range, wherein the upper limit of the first frequency range is less than the preset frequency. If the drying stage is the later stage of drying, then the number of at least one alternative vibration frequencies corresponding to the drying stage is multiple, and the multiple alternative vibration frequencies are located within a second frequency range, wherein the upper limit of the second frequency range is less than the upper limit of the first frequency range, the lower limit of the second frequency range is less than the lower limit of the first frequency range, and the moisture content of the material reaches the target moisture content after the later stage of drying is completed.
[0008] In some optional embodiments, before obtaining the multiple alternative parameter sets corresponding to the drying stage, the method further includes: Based on the vacuum level of the drying chamber, the saturation temperature of water under that vacuum level is obtained; Based on the saturation temperature, multiple candidate temperatures corresponding to the vacuum degree are obtained. Each candidate temperature is greater than the saturation temperature, and the difference between the candidate temperature and the saturation temperature is within a numerical range.
[0009] In some optional embodiments, the vacuum dryer further includes: a condensate collection tank and a water level sensor located within the condensate collection tank, the condensate collection tank being used to contain moisture precipitated from the material; the method further includes, before adjusting the target parameter set: The water level sensor is used to obtain the liquid level height of the condensate collection tank. Based on the liquid level, determine the weight of water that has separated from the material; The real-time moisture content of the material is obtained based on the weight of water extracted from the material, and the real-time moisture content is negatively correlated with the weight of water extracted from the material.
[0010] In some optional embodiments, obtaining the reference change relationship includes: Obtain the limiting change relationship, which is: the change relationship of the moisture content of the material with the drying time during the process of drying the material using the limiting vibration frequency and the limiting temperature to reduce the moisture content of the material to the target moisture content, wherein the limiting temperature is the highest temperature that will not damage the material; Based on the target duration, the limit duration, and the limit change relationship, a reference change relationship is obtained. The limit duration is the total drying time required to reduce the moisture content of the material to the target moisture content by using the limit vibration frequency and the limit temperature.
[0011] A second objective of this application is to provide a controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the drying method for the material as described above.
[0012] A third objective of this application is to provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the drying method for the material as described above.
[0013] The fourth objective of this application is to provide a vacuum dryer, said vacuum dryer comprising: The drying chamber, the vibration motor, the vacuum pump, and the controller as described above, the controller being connected to the vibration motor and the vacuum pump; The drying chamber is used to contain materials, the vibration motor is used to provide vibration force to the drying chamber, and the vacuum pump is used to extract air from the drying chamber.
[0014] Optionally, the vacuum dryer further includes: a condensate collection tank, and a water level sensor located inside the condensate collection tank; The condensate collection tank is used to contain the water that precipitates from the material, and the water level sensor is used to measure the liquid level height in the condensate collection tank; The controller is also connected to the water level sensor.
[0015] The fourth objective of this application is to provide a computer program product comprising a computer program that, when executed by a processor, implements the drying method for the material as described above.
[0016] The beneficial effects of the technical solution provided in this application can include at least the following: This application provides a material drying method, controller, and vacuum dryer. The method obtains a reference change relationship and, during each drying stage, uses the target parameter set corresponding to that stage to dry the material. If the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the range of the target time, the target parameter set is adjusted, and the adjusted target parameter set is used to dry the material so that the real-time moisture content of the material at the end of the last drying stage is less than or equal to the reference moisture content. In other words, this method can promptly adjust the target parameter set when the real-time moisture content deviates significantly from the reference moisture content, and using the adjusted target parameter set ensures that the real-time moisture content of the material at the end of the last drying stage is less than or equal to the reference moisture content. Therefore, it can effectively ensure that the moisture content of the material is reduced to the target moisture content after the total drying time reaches the target time. Furthermore, since the reference moisture content at the target time is determined based on a reference change relationship and the target time, and this reference change relationship represents the change in the material's moisture content with the drying time after the material's moisture content has been reduced to the target moisture content within the target time period, the reliability of this reference moisture content can be ensured, thereby ensuring accurate adjustment of the target parameter set. In addition, since the method provided in this application supports adjusting the target parameter set at each drying stage, precise dynamic control of the material drying process can be achieved. Compared to adjusting the target parameter set only once throughout the entire drying process, the method provided in this application can reduce drying energy consumption while ensuring drying efficiency, thereby reducing drying costs.
[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of a vacuum dryer provided in an embodiment of this application; Figure 2 This is a flowchart of a material drying method provided in an embodiment of this application; Figure 3This is a flowchart of another material drying method provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of a controller provided in an embodiment of this application. Detailed Implementation
[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0020] This application provides a vacuum dryer, see [link to relevant documentation]. Figure 1 The vacuum dryer includes: a controller 01, a drying chamber 02, a jacket 03, a dust collector 04, a condenser 05, a condensate collection tank 06, a water level sensor 07, a vacuum sensor 08, a vacuum pump 09, and a vibration motor 10. The controller 01 can be a programmable logic controller (PLC).
[0021] The drying chamber 02 is used to contain the material to be dried, and the drying chamber 02 is provided with an inlet and an outlet. The material to be dried can enter the drying chamber 02 through the inlet and flow out through the outlet after drying is completed. Optionally, the material can be a cathode material, such as a ternary cathode material.
[0022] A jacket 03 surrounds the drying chamber 02, forming a heating space between the jacket 03 and the drying chamber 02. The jacket 03 is equipped with a steam inlet, a steam outlet, and a condensate outlet. Steam supplied by a steam source interface or a steam generator enters the heating space through the steam inlet, transferring heat through the outer wall of the drying chamber 02 to the material inside, thus exchanging heat with the material and achieving drying. Part of the steam condenses into condensate and flows out through the condensate outlet below the jacket 03, while the remaining uncondensed steam flows out through the steam outlet above the jacket 03.
[0023] See also Figure 1The drying chamber 02, dust collector 04, condenser 05, and condensate collection tank 06 are connected in sequence. Water vapor generated during drying can be converted into condensate by passing through the dust collector 04 and condenser 05, and then flows back to the condensate collection tank 06. The condensate collection tank 06 is equipped with a water level sensor 07 (i.e., a water level gauge), which is inserted into the condensate collection tank 06 from the top. The water level gauge 07 can collect the water level in the condensate collection tank 06 and send this level to the controller 01. The controller 01 can then obtain the real-time moisture content of the material in the drying chamber 02 based on this water level.
[0024] like Figure 1 As shown, a vacuum sensor 08 is also provided on the drying chamber 02, which can collect the vacuum level inside the drying chamber 02. The controller 01 is also connected to the vacuum sensor 08 and the vacuum pump 09, and can obtain the vacuum level inside the drying chamber 02 through the vacuum sensor 08, and control the vacuum pump 09 based on the vacuum level.
[0025] Before drying the material, the vacuum pump 09, under the control of the controller 01, extracts air from the drying chamber 02, bringing the vacuum level inside the drying chamber 02 to the required level. This reduces the air pressure inside the drying chamber 02, lowering the boiling point of the moisture (or solvent) in the material. This allows for efficient evaporation of moisture at low temperatures, preventing damage to heat-sensitive materials (such as decomposition or denaturation of active ingredients) and reducing the impact of oxygen on easily oxidized materials.
[0026] Furthermore, during the drying process, the vacuum pump 09, under the control of the controller 01, can continuously pump air to maintain a vacuum environment and ensure that water vapor in the drying chamber 02 is discharged in a timely manner. Specifically, after the material is heated in the drying chamber 02 and the moisture in the material vaporizes, the vacuum pump 09 can also pump the high-temperature water vapor to the condenser 05 to maintain a stable vacuum level in the drying chamber 02 until the moisture content of the material reaches the target moisture content.
[0027] Vacuum pump 09 is also connected to condensate collection tank 06 via vacuum pipeline. Therefore, the gas extracted from drying chamber 02 will first be processed by condenser 05 before entering vacuum pump 09, thereby reducing the damage to vacuum pump 09 caused by water vapor.
[0028] The vibrating motor 10 is connected to both the drying chamber 02 and the controller 01. Under the control of the controller 01, the vibrating motor 10 generates high-frequency, low-amplitude vibrations to provide vibrational force to the drying chamber, thereby driving the material inside the drying chamber 02 to undergo a spiral jumping motion, breaking up agglomerated materials and ensuring uniform dispersion. The high frequency is 10 to 50 Hz, and the low amplitude is 1 to 5 mm.
[0029] The controller 01 is also connected to a frequency sensor 11, which can acquire the frequency of the vibration motor 10 and send the acquired frequency to the controller 01. The controller 01 can then control the vibration motor to operate based on the received frequency.
[0030] In addition, the vacuum dryer may also include a frequency sensor, a material temperature sensor, a steam temperature sensor, and a steam valve. The frequency sensor can acquire the frequency of the vibrating motor 10 and send the acquired frequency to the controller 01. The controller 01 can then control the operation of the vibrating motor based on the received frequency.
[0031] The drying chamber 02 may also be equipped with a temperature measuring hole. Figure 1 (Not shown in the image), a material temperature sensor is inserted into the temperature measuring hole. This material temperature sensor can collect the temperature of the material inside the drying chamber. The controller 01 can also be connected to this material temperature sensor and can obtain the temperature of the material inside the drying chamber through the material temperature sensor.
[0032] Before entering the heating space between the drying chamber 02 and the jacket 03, the steam pressure needs to be stabilized at a preset value by the steam valve 10. A steam temperature sensor is used to collect the steam temperature. The controller 01 can also be connected to the steam temperature sensor and can obtain the steam temperature through the steam temperature sensor.
[0033] This application provides a method for drying materials, which is applied to the controller of a vacuum dryer. For example, the vacuum dryer can be... Figure 1 The vacuum dryer shown. See also Figure 2 The method includes: Step 101: Obtain the reference change relationship.
[0034] The reference relationship is as follows: when the moisture content of the material is reduced to the target moisture content through drying within the target time, the relationship between the moisture content of the material and the drying time.
[0035] Optionally, the reference change relationship can be pre-stored by the controller. Alternatively, the controller can acquire the limiting change relationship and obtain the reference change relationship based on the target duration, the limiting duration, and the limiting change relationship. The limiting change relationship is defined as the change in the material's moisture content with drying time during the process of drying the material using the limiting vibration frequency and limiting temperature to reduce the material's moisture content to the target moisture content. The limiting temperature is the highest temperature that will not damage the material. The limiting duration is the total drying time required to reduce the material's moisture content to the target moisture content using the limiting vibration frequency and limiting temperature.
[0036] Step 102: During the drying process of the material at each drying stage, if the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the range of the target value, then the target parameter set is adjusted.
[0037] The target drying time is the sum of the durations of multiple drying stages, with the material's moisture content decreasing sequentially within each stage. The reference moisture content at the target time is determined based on a reference change relationship and the target time. Specifically, the controller can determine the drying time of the material based on the material's drying start time and the target time, and determine the moisture content corresponding to that drying time in the reference change relationship as the reference moisture content. Therefore, this reference moisture content refers to the expected moisture content of the material at the target time, ensuring that the material's moisture content is dried to the target moisture content within the target drying time. Correspondingly, the reference moisture content at the end of the last drying stage is the target moisture content.
[0038] The difference between the real-time moisture content and the reference moisture content refers to the difference obtained by subtracting the reference moisture content from the real-time moisture content. This difference range can be pre-stored by the controller. The target parameter set can include at least one of the target vibration frequency and the target temperature, such as including both the target vibration frequency and the target temperature. Optionally, the target parameter set can be randomly obtained by the controller, or the target parameter set can be the candidate parameter set with the lowest drying cost selected by the controller from multiple candidate parameter sets corresponding to the drying stage.
[0039] In this embodiment, during each drying stage, the controller can acquire the real-time moisture content and reference moisture content at each moment, and detect whether the difference between the real-time moisture content and the reference moisture content is outside the range of difference. If the controller determines that the difference between the real-time moisture content and the reference moisture content of the material at each moment is within the range of difference, it can be determined that the current drying process is close to the expected drying process, and then the material can be dried according to the target parameter set.
[0040] If the controller determines that the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the specified range, then the real-time moisture content at the target time is either too high or too low. If it is too high, it means that if the material continues to be dried according to the current set of target parameters, the moisture content may not reach the target level after the drying time reaches the target duration. If it is too low, it means that continuing to dry the material according to the current set of target parameters will result in high drying costs. Therefore, the controller can adjust the set of target parameters.
[0041] Step 103: Dry the material using the adjusted target parameter set so that the real-time moisture content at the end of the last drying stage is less than or equal to the reference moisture content.
[0042] After adjusting the target parameter set, the controller can use the adjusted target parameter set to dry the material. For each drying stage except the last drying stage, using the adjusted target parameter set ensures that the difference between the real-time moisture content and the reference moisture content at the end of the drying process is within a certain range. For the last drying stage, using the adjusted target parameter set ensures that the real-time moisture content of the material at the end of the drying process is less than or equal to the reference moisture content (i.e., the target moisture content).
[0043] In summary, the embodiments of this application provide a material drying method. This method can obtain a reference change relationship, and during the drying process using the target parameter set corresponding to each drying stage, if the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the range of the difference, the target parameter set is adjusted, and the adjusted target parameter set is used to dry the material so that the real-time moisture content of the material at the end of the last drying stage is less than or equal to the reference moisture content. That is, this method can adjust the target parameter set in a timely manner when the real-time moisture content deviates significantly from the reference moisture content, and the drying using the adjusted target parameter set ensures that the real-time moisture content of the material at the end of the last drying stage is less than or equal to the reference moisture content. Therefore, it can effectively ensure that the moisture content of the material can be reduced to the target moisture content after the total drying time reaches the target time. Furthermore, since the reference moisture content at the target time is determined based on a reference change relationship and the target time, and this reference change relationship is the relationship between the material's moisture content and the drying time when the material's moisture content is reduced to the target moisture content through drying within the target time period, the reliability of this reference moisture content can be ensured to be high, thereby ensuring accurate adjustment of the target parameter set. In addition, since the method provided in this application embodiment supports adjusting the target parameter set at each drying stage, precise dynamic control of the material drying process can be achieved. Compared to adjusting the target parameter set only once throughout the entire drying process, the method provided in this application embodiment can reduce drying energy consumption while ensuring drying efficiency, thereby reducing drying costs.
[0044] Figure 3 This is a flowchart of another material drying method provided in an embodiment of this application, which is applied to the controller of a vacuum dryer. See also Figure 3 The method may include: Step 201: Obtain the limit change relationship.
[0045] The limiting change relationship is defined as the change in moisture content of a material with drying time during the drying process, using limiting vibration frequencies and limiting temperatures to reduce the material's moisture content to a target level. This relationship represents the complete change in moisture content. Optionally, this limiting change relationship can be represented by a function or a curve, such as a curve.
[0046] The limiting vibration frequency is the maximum vibration frequency supported by the vibratory motor, i.e., the upper limit of the vibration frequency of the vibratory motor, such as 50Hz. The limiting temperature is the highest temperature at which the material will not be damaged. Assuming the material is a cathode material, if the drying temperature of the cathode material exceeds this limiting temperature, the residual alkali (i.e., lithium hydroxide) index on the surface of the cathode material will change significantly.
[0047] In this embodiment, the limiting change relationship can be pre-stored by the controller. Alternatively, since the amount of material to be dried is generally large, it is usually necessary to dry the material in batches. In this case, the controller can first use the limiting vibration frequency and limiting temperature to dry the first batch of material to reduce the moisture content of the first batch of material to the target moisture content; during the drying process, the moisture content and drying time of the first batch of material are acquired in real time; after the drying is completed, the acquired multiple moisture contents and corresponding drying times are fitted to obtain the limiting change relationship.
[0048] Since the limiting change relationship is obtained during the drying process of the first batch of material, it accurately reflects the change in the moisture content of the material during drying. Therefore, by adjusting the target parameter set based on the reference change relationship determined by this limiting change relationship, we can ensure accurate and efficient drying of the material, avoid damaging the material during the drying process, and reduce drying energy consumption.
[0049] Understandably, operators can input the limiting vibration frequency, limiting temperature, and target moisture content into the controller. Correspondingly, the controller can respond to the operator's input of the limiting vibration frequency and target temperature, acquire these parameters, and then use them to dry the material until the material's moisture content decreases to the target level.
[0050] In this embodiment of the application, after reducing the moisture content of the first batch of materials to the target moisture content, the controller can also obtain the limit time used to dry the first batch of materials, that is, the actual time used to dry the materials to the target moisture content according to the limit vibration frequency and the limit temperature.
[0051] Step 202: Based on the target duration, the limit duration, and the limit change relationship, obtain the reference change relationship.
[0052] The reference variation relationship refers to the relationship between the material's moisture content and the drying time, assuming the material's moisture content is reduced to the target moisture content within the target time period. The target time is the expected time required to reduce the material's moisture content to the target moisture content through drying.
[0053] The target duration can be greater than or equal to the maximum total duration. It should be understood that operating a vacuum dryer at its maximum vibration frequency and maximum temperature for an extended period will damage it. Therefore, to extend the service life of the vacuum dryer, the target duration is usually set to be greater than the maximum total duration.
[0054] In one optional implementation, when the limiting change relationship is represented by a curve (hereinafter referred to as the limiting change curve), the controller can obtain the ratio of the target duration to the limiting duration and map the limiting change curve based on this ratio to obtain a reference change curve. Specifically, for each time in the reference change curve, the controller can determine the mapping time of that time to the limiting change curve based on the ratio, and then determine the water content corresponding to that mapping time in the limiting change curve as the water content corresponding to that time in the reference change curve. Here, the mapping time is the quotient of that time and the ratio.
[0055] For example, assuming that in the limiting change curve, 0 min corresponds to an initial moisture content of 80%, 10 min corresponds to a moisture content of 60%, 20 min corresponds to a moisture content of 20%, and 40 min corresponds to a target moisture content of 10%, and assuming the target duration is 80 min, and the ratio of the target duration to the limiting duration is 2, then the controller can determine that the mapping time of 80 min in the reference change curve is 40 min in the limiting change curve, and the moisture content corresponding to 80 min is 10%; the mapping time of 40 min in the reference change curve is 20 min in the limiting change curve, corresponding to a moisture content of 20%; the mapping time of 20 min in the reference change curve is 10 min in the limiting change curve, corresponding to a moisture content of 60%; and the mapping time of 0 min is 0 min in the limiting change curve, corresponding to a moisture content of 80%.
[0056] As described above, the reference change curve is essentially a stretching of time in the limit change curve, resulting in a curve that slows down the change in moisture content presented by the limit change curve.
[0057] In another alternative implementation, the controller pre-stores a relationship generation model. The controller can input the target duration, the limit duration, and the limit change relationship into this relationship generation model to obtain the reference change relationship output by the relationship generation model.
[0058] Understandably, before inputting the target duration, limit duration, and limit change relationship into the relationship generation model, the controller can acquire multiple training data sets and train the model using these sets to obtain the relationship generation model. Each training data set includes: a first change relationship for the sample material, a first duration corresponding to the first change relationship, a second duration, and a second change relationship corresponding to the second duration. The first change relationship is the change in moisture content of the sample material with drying time during the drying process, using the limit vibration frequency and the highest temperature that does not damage the sample material to reduce its moisture content to the sample's target moisture content. The first duration is the time required to dry the sample material to its target moisture content using the limit vibration frequency and the highest temperature that does not damage the sample material. The second change relationship is the change in moisture content of the sample material with drying time during the second duration, without damaging the sample material and ensuring the lowest possible drying cost. The second duration is greater than or equal to the first duration.
[0059] Step 203: Obtain multiple alternative parameter sets corresponding to each drying stage.
[0060] The target duration is the sum of the durations of multiple drying stages. The multiple candidate parameter sets corresponding to each drying stage can be determined based on at least one candidate vibration frequency corresponding to that drying stage and multiple candidate temperatures corresponding to the vacuum level of the drying chamber. Each candidate parameter set includes: one candidate vibration frequency and one candidate temperature. The candidate vibration frequencies and / or candidate temperatures in any two candidate parameter sets are different.
[0061] In the embodiments of this application, for each drying stage, before entering the drying stage or when entering the drying stage, the controller can arrange and combine at least one alternative vibration frequency corresponding to the drying stage and multiple alternative temperatures corresponding to the vacuum degree of the drying chamber to obtain multiple alternative parameter sets.
[0062] At least one alternative vibration frequency corresponding to each drying stage can be pre-stored by the controller. For example, suppose multiple drying stages include: initial drying, intermediate drying, and final drying. The moisture content of the material decreases sequentially from the initial drying stage to the final drying stage. That is, the moisture content of the material in the intermediate drying stage is lower than that in the intermediate drying stage, and the moisture content of the material in the final drying stage is lower than that in the intermediate drying stage. Furthermore, the moisture content of the material needs to reach the target moisture content after the final drying stage.
[0063] At this point, for each drying stage, if the drying stage is the initial drying stage, then the number of at least one alternative vibration frequency corresponding to that drying stage is one. This alternative frequency is a pre-stored preset frequency. This preset frequency can be the limiting vibration frequency, or slightly less than the limiting vibration frequency.
[0064] If the drying stage is the middle stage, then there are multiple alternative vibration frequencies corresponding to this drying stage. These multiple alternative vibration frequencies are located within a first frequency range. The upper limit of the first frequency range is less than a preset frequency.
[0065] If the drying stage is the later stage of drying, then there are multiple alternative vibration frequencies corresponding to this drying stage, and these multiple alternative vibration frequencies are located within a second frequency range. The upper limit of the second frequency range is less than the upper limit of the first frequency range, and the lower limit of the second frequency range is less than the lower limit of the first frequency range.
[0066] For example, assume the initial moisture content of the material is... w 0, the target moisture content is w 1, and 2× w 1 < 0.5 × w 0, that is w 1 < 0.25 × w 0. Assume that the initial drying stage refers to a material moisture content greater than 0.5× w The drying stage is 0%, and the middle stage of drying refers to the material's moisture content being less than or equal to 0.5×. w 0 but greater than 2× w The drying stage 1, the later drying stage refers to the stage where the moisture content of the material is less than or equal to 2× w 1 but greater than w Drying stage 1. Assuming the preset frequency is 50Hz, at least one alternative frequency corresponding to different drying stages can satisfy: Formula (1) As can be seen from formula (1), different moisture contents (i.e., different drying stages) correspond to different alternative frequencies. In this way, energy consumption and material damage can be reduced.
[0067] In this embodiment, the process by which the controller obtains multiple candidate temperatures corresponding to the vacuum level of the drying chamber may include: obtaining the saturation temperature of water at that vacuum level, and obtaining multiple candidate temperatures corresponding to that vacuum level based on the saturation temperature of the water. Each candidate temperature is greater than the saturation temperature, and the difference between the candidate and the saturation temperature is within a numerical range. This numerical range may be pre-stored by the controller. For example, the lower limit of this numerical range may be 20 degrees Celsius (°C), and the upper limit may be 50°C. That is, the candidate temperatures... Tb It can satisfy: Tb = Ts +t (t=20~50℃). Ts This is the saturation temperature of water at this vacuum level.
[0068] Understandably, the controller can use the Antoine equation to calculate the saturation temperature of the water. Ts Alternatively, the Wagner equation can be used to calculate the saturation temperature of water. Ts .
[0069] The Antoine equation satisfies: . A , B and C All are Antoine constants, such as A It could be 7.96681. B It could be 1668.21. C It can be 228. P is the saturated vapor pressure of water, determined based on the real-time vacuum level.
[0070] Understandably, during the drying stage, the controller can use a vacuum sensor located on the drying chamber to obtain the vacuum level within the chamber, and then determine the corresponding candidate temperature. This ensures high accuracy of the obtained vacuum level, thereby guaranteeing high reliability of the target temperature in the final set of target parameters.
[0071] Alternatively, the vacuum level can be pre-stored in the controller. Simply put, before drying the material, the controller needs to control the vacuum pump to evacuate air to bring the vacuum level in the drying chamber to a preset value. During the drying process, the controller needs to maintain this preset value by controlling the vacuum level in the drying chamber through the vacuum pump. In other words, the vacuum level needs to remain stable during the drying process, so the preset value can be input into the controller in advance.
[0072] Step 204: Obtain the drying cost of each alternative parameter set in the multiple alternative parameter sets.
[0073] For each of a set of candidate parameter values, the controller can determine the drying cost of drying the material using that set of candidate parameters based on the candidate frequency and candidate temperature within that set. The drying cost of each candidate parameter set is positively correlated with both the candidate frequency and candidate temperature within that set. For example, the drying cost can satisfy: Formula (2) In formula (2), f As alternative vibration frequencies, T Alternative temperatures.
[0074] Step 205: Determine the set of alternative parameters with the lowest drying cost as the target parameter set.
[0075] The controller can compare the drying costs of multiple alternative parameter sets to obtain the alternative parameter set with the lowest drying cost, and then determine the alternative parameter set with the lowest drying cost as the target parameter set.
[0076] Since the target parameter set that minimizes drying cost can be selected for drying, the drying cost of the material can be reduced to a large extent, provided that the total drying time reaches the target time and the moisture content of the material reaches the target moisture content.
[0077] Step 206: During the drying stage, if the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the range of the target time, the target parameter set is adjusted.
[0078] After entering each drying stage, the controller can use the target parameter set corresponding to that drying stage to dry the material. Simply put, if the target parameter set includes a target temperature and a target vibration frequency, the controller can control the vibration motor to operate at the target vibration frequency and control the temperature of the steam entering the heating space to the target temperature in order to dry the material.
[0079] During the drying process, the controller can acquire the real-time moisture content and reference moisture content at various times. The reference moisture content at each time point is determined based on the relationship between that time and a reference change. For example, the controller can calculate the drying time of the material based on the drying start time and that time, and then determine the moisture content corresponding to that drying time in the reference change relationship as the reference moisture content. It should be understood that if the material is dried in batches, the drying start time of each batch is the time when drying begins for that batch of material.
[0080] Subsequently, the controller can detect whether the difference between the real-time moisture content and the reference moisture content is outside the acceptable range. If the controller determines that the difference between the real-time moisture content and the reference moisture content at each time point is within the acceptable range, it can be determined that the current drying process closely matches the desired drying process, and the material can then be dried according to the target parameter set. If the controller determines that the difference between the real-time moisture content and the reference moisture content at the target time is outside the acceptable range, it can be determined that the real-time moisture content at the target time is too high or too low. Too high a moisture content indicates that if the material continues to be dried according to the current target parameter set, the moisture content may not reach the target moisture content after the target drying time has been reached. Too low a moisture content indicates that if the material continues to be dried according to the current target parameter set, the drying cost will be high. Therefore, the controller can adjust the target parameter set.
[0081] In this embodiment, the controller can adjust the target parameter set based on the difference between the real-time moisture content and the reference moisture content at the target time. Specifically, if the difference is greater than a difference threshold, i.e., the difference is large, the controller can adjust the target parameter set by first adjusting the target temperature, and then adjusting the target vibration frequency. That is, the controller can first adjust the target temperature, and if this still fails to bring the difference between the real-time moisture content and the corresponding reference moisture content within the acceptable range, then adjust the target vibration frequency.
[0082] For example, when the difference exceeds a threshold, the controller can first adjust the target temperature slightly, with the adjustment range controlled within (0, 10)℃. After the adjustment time reaches a preset duration, it obtains the current real-time moisture content. If the difference between the real-time moisture content and the corresponding reference moisture content is still outside the difference range, the controller continues to adjust the target temperature until the adjusted target temperature reaches the limit temperature, and / or the difference between the real-time moisture content and the corresponding reference moisture content is within the difference range. The preset duration can be pre-stored by the controller, for example, 5 minutes. The adjustment range being controlled within (0, 10)℃ means that the adjustment range is greater than 0 and less than 10℃.
[0083] If the adjusted target temperature reaches the limit temperature, and the difference between the real-time moisture content and the corresponding reference moisture content is still outside the difference range, then the target vibration frequency is adjusted. The single frequency adjustment amplitude is controlled to increase by (0, 5) Hz. After the adjustment time reaches the preset time, the current real-time moisture content is obtained. If the difference between the real-time moisture content and the corresponding reference moisture content is still outside the difference range, the operation of adjusting the target vibration frequency continues until the adjusted target vibration frequency reaches the limit vibration frequency.
[0084] If the difference is less than or equal to the difference threshold, i.e., the difference is small, the controller can adjust the target parameter set by prioritizing the target vibration frequency and then adjusting the target temperature. In other words, the controller can first adjust the target vibration frequency; if this still fails to bring the difference between the real-time moisture content and the corresponding reference moisture content within the acceptable range, then the target temperature will be adjusted.
[0085] The specific adjustment method can refer to the adjustment method when the difference is greater than the difference threshold, which will not be repeated here in the embodiments of this application. It should be understood that at this time, the single frequency adjustment amplitude of the vibration frequency is controlled to increase by (0, 3) Hz, and the single adjustment amplitude of the target temperature is controlled at (0, 5) ℃.
[0086] In this embodiment, the controller can determine the current drying stage based on the moisture content of the material. For example, suppose the initial drying stage refers to a material moisture content greater than 0.5 × 10⁻⁶. wThe drying stage is 0%, and the middle stage of drying refers to the material's moisture content being less than or equal to 0.5×. w 0 but greater than 2× w The drying stage 1, the later drying stage refers to the stage where the moisture content of the material is less than or equal to 2× w 1 but greater than w The drying stage is 1. Therefore, by default, when the material begins drying, it enters the initial drying stage; the drying process continues until the material's moisture content decreases to 0.5 × 10⁻⁶. w At 0:00, it enters the middle stage of drying; when the moisture content of the material decreases to 2× w At 1 o'clock, it enters the later stage of drying.
[0087] In this embodiment, the controller can obtain the liquid level height of the condensate collection tank via a water level sensor located inside the condensate collection tank. Subsequently, the controller can determine the weight of water precipitated from the material based on this liquid level height, and obtain the real-time moisture content of the material based on this weight. This real-time moisture content is negatively correlated with the weight of water precipitated from the material.
[0088] For example, the real-time moisture content w r It can satisfy: Formula (3) In formula (3), w 0 represents the initial moisture content of the material before drying. This represents the weight of water that has been extracted from the material. ρ The density of water, r The radius of the condensate collection tank, H This refers to the liquid level in the condensate collection tank.
[0089] The aforementioned method of determining the real-time moisture content of the material by acquiring the liquid level in the condensate collection tank is an exemplary implementation. It is understood that the controller can also acquire the real-time moisture content through other methods, such as monitoring with a near-infrared sensor; this application embodiment is not limited to this method.
[0090] Step 207: Dry the material using the adjusted target parameter set so that the real-time moisture content at the end of the last drying stage is less than or equal to the reference moisture content.
[0091] After adjusting the target parameter set, the controller can use the adjusted target parameter set to dry the material. For each drying stage except the last drying stage, using the adjusted target parameter set ensures that the difference between the real-time moisture content and the reference moisture content at the end of the drying process is within a certain range. For the last drying stage, using the adjusted target parameter set ensures that the real-time moisture content of the material at the end of the drying process is less than or equal to the reference moisture content (i.e., the target moisture content).
[0092] It should be understood that when the moisture content reaches the target moisture content... w After step 1, the controller can determine that drying is complete and then stop drying the material. Specifically, the controller can control the vibrating motor to stop working, that is, control the vibration frequency of the vibrating motor to 0 and stop supplying steam to the heating space.
[0093] It is understood that the order of steps in the material drying method provided in this application embodiment can be appropriately adjusted, and steps can be added or removed as needed. For example, steps 201 and 202 can be deleted as needed, i.e., the controller has pre-stored reference variation relationships. Any variations that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application, and therefore will not be elaborated further.
[0094] In summary, the embodiments of this application provide a material drying method. This method can obtain a reference change relationship, and during the drying process using the target parameter set corresponding to each drying stage, if the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the range of the difference, the target parameter set is adjusted, and the adjusted target parameter set is used to dry the material so that the real-time moisture content of the material at the end of the last drying stage is less than or equal to the reference moisture content. That is, this method can adjust the target parameter set in a timely manner when the real-time moisture content deviates significantly from the reference moisture content, and the drying using the adjusted target parameter set ensures that the real-time moisture content of the material at the end of the last drying stage is less than or equal to the reference moisture content. Therefore, it can effectively ensure that the moisture content of the material can be reduced to the target moisture content after the total drying time reaches the target time. Furthermore, since the reference moisture content at the target time is determined based on a reference change relationship and the target time, and this reference change relationship is the relationship between the material's moisture content and the drying time when the material's moisture content is reduced to the target moisture content through drying within the target time period, the reliability of this reference moisture content can be ensured to be high, thereby ensuring accurate adjustment of the target parameter set. In addition, since the method provided in this application embodiment supports adjusting the target parameter set at each drying stage, precise dynamic control of the material drying process can be achieved. Compared to adjusting the target parameter set only once throughout the entire drying process, the method provided in this application embodiment can reduce drying energy consumption while ensuring drying efficiency, thereby reducing drying costs.
[0095] This application provides a controller for use in a vacuum dryer. This controller is used to execute the material drying method provided in the above-described method embodiments. See also... Figure 4 The controller 01 includes a processor 011. The processor 011 is used for: Obtain a reference variation relationship. This reference variation relationship is: the change in the moisture content of the material with the drying time, assuming the moisture content of the material is reduced to the target moisture content through drying within the target time period; During the drying process of the material at each drying stage, if the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the range of the difference, the target parameter set is adjusted. The reference moisture content is determined based on the reference change relationship and the target time. The target parameter set includes at least one of the target vibration frequency and the target temperature. The material is dried using an adjusted set of target parameters so that the real-time moisture content of the material at the end of the last drying stage is less than or equal to the reference moisture content.
[0096] In some optional embodiments, the vacuum dryer further includes a drying chamber for containing materials. The processor 011 can also be used for: Before drying the material using the target parameter set corresponding to the drying stage, multiple alternative parameter sets corresponding to the drying stage are obtained. These multiple alternative parameter sets are determined based on at least one alternative vibration frequency corresponding to the drying stage and multiple alternative temperatures corresponding to the vacuum degree of the drying chamber. Each alternative parameter set includes: an alternative vibration frequency and an alternative temperature. Obtain the drying cost for each set of alternative parameters. The drying cost is proportional to the alternative vibration frequency and alternative temperature in the set of alternative parameters. The set of alternative parameters that minimizes drying costs is determined as the target parameter set.
[0097] In some alternative embodiments, the material is a positive electrode material. Drying cost. cost satisfy: ; in, f As alternative vibration frequencies, T Alternative temperatures.
[0098] In some optional embodiments, for each drying stage, if the drying stage is the initial drying stage, then the number of at least one alternative vibration frequency corresponding to the drying stage is one, and the alternative frequency is a preset frequency. If the drying stage is the middle of the drying process, then the number of at least one alternative vibration frequencies corresponding to the drying stage is multiple, and the multiple alternative vibration frequencies are located within a first frequency range, wherein the upper limit of the first frequency range is less than a preset frequency. If the drying stage is the later stage of drying, then there are multiple alternative vibration frequencies corresponding to the drying stage. These multiple alternative vibration frequencies are located within the second frequency range. The upper limit of the second frequency range is less than the upper limit of the first frequency range, and the lower limit of the second frequency range is less than the lower limit of the first frequency range. After the later stage of drying, the moisture content of the material reaches the target moisture content.
[0099] In some alternative embodiments, the processor 011 may also be used for: Before obtaining multiple alternative parameter sets corresponding to the drying stage, the saturation temperature of water under vacuum is obtained based on the vacuum degree of the drying chamber. Based on the saturation temperature, multiple candidate temperatures corresponding to the vacuum degree are obtained. Each candidate temperature is greater than the saturation temperature, and the difference between the candidate temperature and the saturation temperature is within the numerical range.
[0100] In some optional embodiments, the vacuum dryer further includes a condensate collection tank and a water level sensor located within the condensate collection tank, the condensate collection tank being used to contain moisture precipitated from the material. The processor 011 can also be used for: Before adjusting the target parameter set, the liquid level height of the condensate collection tank is obtained through a water level sensor; Based on the liquid level, determine the weight of water that has separated from the material; The real-time moisture content of the material is obtained based on the weight of water extracted from it, and the real-time moisture content is negatively correlated with the weight of water extracted from the material.
[0101] In some alternative embodiments, the processor 011 can be used for: Obtain the limiting change relationship, which is: the relationship between the moisture content of the material and the drying time during the process of drying the material using the limiting vibration frequency and the limiting temperature to reduce the moisture content of the material to the target moisture content. The limiting temperature is the highest temperature that will not damage the material. Based on the target duration, the limit duration, and the limit change relationship, a reference change relationship is obtained. The limit duration is the total drying time required to reduce the moisture content of the material to the target moisture content by using the limit vibration frequency and the limit temperature.
[0102] In summary, this application provides a controller capable of acquiring a reference change relationship. During the drying process using the target parameter set corresponding to each drying stage, if the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the range of the target value, the target parameter set is adjusted, and the adjusted target parameter set is used to dry the material, ensuring that the real-time moisture content of the material is less than or equal to the reference moisture content at the end of the last drying stage. That is, when the real-time moisture content deviates significantly from the reference moisture content, the controller can promptly adjust the target parameter set, and using the adjusted target parameter set ensures that the real-time moisture content of the material is less than or equal to the reference moisture content at the end of the last drying stage. Therefore, it can effectively ensure that the moisture content of the material is reduced to the target moisture content after the total drying time reaches the target time. Furthermore, since the reference moisture content at the target time is determined based on a reference change relationship and the target time—which represents the change in material moisture content over drying time after the material's moisture content has been reduced to the target moisture content within the target timeframe—the reliability of this reference moisture content is high, ensuring precise adjustment of the target parameter set. In addition, because the controller supports adjusting the target parameter set at each drying stage, precise dynamic control of the material drying process can be achieved. Compared to adjusting the target parameter set only once throughout the entire drying process, this approach reduces drying energy consumption while maintaining drying efficiency, thereby lowering drying costs.
[0103] like Figure 4 As shown, the controller 01 includes a memory 013. The processor 011 is connected to the memory 013, for example, via a bus 012. Optionally, the controller 01 may also include a transceiver 014. It should be noted that in practical applications, the transceiver 014 is not limited to one, and the structure of the controller 01 does not constitute a limitation on the embodiments of this application.
[0104] Processor 011 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 011 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.
[0105] Bus 012 may include a pathway for transmitting information between the aforementioned components. Bus 012 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 012 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.
[0106] The memory 013 stores a computer program corresponding to the material drying method provided in the above embodiments of this application. This computer program is controlled and executed by the processor 011. The processor 011 executes the computer program stored in the memory 013 to implement the content shown in the aforementioned method embodiments.
[0107] This application provides a computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements the material drying method provided in the above-described method embodiments. For example, Figure 2 or Figure 3 The method shown.
[0108] This application provides a computer program product, which includes a computer program that, when executed by a processor, implements the material drying method provided in the above-described method embodiments. For example, Figure 2 or Figure 3 The method shown.
[0109] This application provides a vacuum dryer, which includes: a drying chamber for containing materials, a vibration motor, and a controller provided in the above-described device embodiment.
[0110] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.
[0111] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0112] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0113] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0114] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0115] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A method for drying a material, characterized in that, A controller for a vacuum dryer; the method includes: Obtain a reference change relationship, which is: the change relationship between the moisture content of the material and the drying time when the moisture content of the material is reduced to the target moisture content through drying within the target time period; During the drying process of the material at each drying stage, if the difference between the real-time moisture content of the material at the target time and the reference moisture content is outside the range of the difference, the target parameter set is adjusted. The reference moisture content is determined based on the reference change relationship and the target time. The target parameter set includes at least one of the target vibration frequency and the target temperature. The material is dried using the adjusted target parameter set so that the real-time moisture content of the material at the end of the last drying stage is less than or equal to the reference moisture content.
2. The method according to claim 1, characterized in that, The vacuum dryer further includes: a drying chamber for containing the material; before drying the material using the target parameter set corresponding to the drying stage, the method further includes: Multiple alternative parameter sets corresponding to the drying stage are obtained, wherein the multiple alternative parameter sets are determined based on at least one alternative vibration frequency corresponding to the drying stage and multiple alternative temperatures corresponding to the vacuum degree of the drying chamber, and each of the alternative parameter sets includes: an alternative vibration frequency and an alternative temperature. Obtain the drying cost for each of the candidate parameter sets, wherein the drying cost is proportional to the candidate vibration frequency and candidate temperature in the candidate parameter set; The set of alternative parameters that minimizes drying cost is determined as the target parameter set.
3. The method according to claim 2, characterized in that, The material is a positive electrode material, and the drying cost is... cost satisfy: ； in, f The alternative vibration frequency, T The alternative temperature is referred to here.
4. The method according to claim 2, characterized in that, For each of the drying stages, if the drying stage is the initial drying stage, then the number of at least one alternative vibration frequency corresponding to the drying stage is one, and the alternative frequency is a preset frequency. If the drying stage is the middle of the drying process, then the number of at least one alternative vibration frequencies corresponding to the drying stage is multiple, and the multiple alternative vibration frequencies are located within a first frequency range, wherein the upper limit of the first frequency range is less than the preset frequency. If the drying stage is the later stage of drying, then the number of at least one alternative vibration frequencies corresponding to the drying stage is multiple, and the multiple alternative vibration frequencies are located within a second frequency range, wherein the upper limit of the second frequency range is less than the upper limit of the first frequency range, the lower limit of the second frequency range is less than the lower limit of the first frequency range, and the moisture content of the material reaches the target moisture content after the later stage of drying is completed.
5. The method according to claim 2, characterized in that, Before obtaining the multiple alternative parameter sets corresponding to the drying stage, the method further includes: Based on the vacuum level of the drying chamber, the saturation temperature of water under that vacuum level is obtained; Based on the saturation temperature, multiple candidate temperatures corresponding to the vacuum degree are obtained. Each candidate temperature is greater than the saturation temperature, and the difference between the candidate temperature and the saturation temperature is within a numerical range.
6. The method according to any one of claims 1 to 5, characterized in that, The vacuum dryer further includes: a condensate collection tank, and a water level sensor located within the condensate collection tank, the condensate collection tank being used to contain moisture precipitated from the material; the method further includes, before adjusting the target parameter set: The water level sensor is used to obtain the liquid level height of the condensate collection tank. Based on the liquid level, determine the weight of water that has separated from the material; The real-time moisture content of the material is obtained based on the weight of water extracted from the material, and the real-time moisture content is negatively correlated with the weight of water extracted from the material.
7. The method according to any one of claims 1 to 5, characterized in that, The acquisition of the reference change relationship includes: Obtain the limiting change relationship, which is: the change relationship of the moisture content of the material with the drying time during the process of drying the material using the limiting vibration frequency and the limiting temperature to reduce the moisture content of the material to the target moisture content, wherein the limiting temperature is the highest temperature that will not damage the material; Based on the target duration, the limit duration, and the limit change relationship, a reference change relationship is obtained. The limit duration is the total drying time required to reduce the moisture content of the material to the target moisture content by using the limit vibration frequency and the limit temperature.
8. A controller, characterized in that, The controller includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the method as described in any one of claims 1-7.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-8.
10. A vacuum dryer, characterized in that, The vacuum dryer includes: The drying chamber, the vibration motor, the vacuum pump, and the controller as described in claim 8, wherein the controller is connected to the vibration motor and the vacuum pump; The drying chamber is used to contain materials, the vibration motor is used to provide vibration force to the drying chamber, and the vacuum pump is used to extract air from the drying chamber.
11. The vacuum dryer according to claim 10, characterized in that, The vacuum dryer also includes: a condensate collection tank, and a water level sensor located inside the condensate collection tank; The condensate collection tank is used to contain the water that precipitates from the material, and the water level sensor is used to measure the liquid level height in the condensate collection tank; The controller is also connected to the water level sensor.